docs: backfill CHANGELOG.md (#327)

* docs: backfill CHANGELOG.md

* fix: GitHub urls

Author: chingor13

CHANGELOG.md

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+# Changelog
+
+## [0.16.2](https://www.github.com/googleapis/google-auth-library-java/compare/v0.16.1...v0.16.2) (2019-06-26)
+
+
+### Bug Fixes
+
+* Add metadata-flavor header to metadata server ping for compute engine ([#283](https://github.com/googleapis/google-auth-library-java/pull/283))
+
+
+### Dependencies
+
+* Import http client bom for dependency management ([#268](https://github.com/googleapis/google-auth-library-java/pull/268))
+
+
+### Documentation
+
+* README section for interop with google-http-client ([#275](https://github.com/googleapis/google-auth-library-java/pull/275))
+
+
+## [0.16.1](https://www.github.com/googleapis/google-auth-library-java/compare/v0.16.0...v0.16.1) (2019-06-06)
+
+
+### Dependencies
+
+* Update dependency com.google.http-client:google-http-client to v1.30.1 ([#265](https://github.com/googleapis/google-auth-library-java/pull/265))
+
+
+## [0.16.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.15.0...v0.16.0) (2019-06-04)
+
+
+### Features
+
+* Add google-auth-library-bom artifact ([#256](https://github.com/googleapis/google-auth-library-java/pull/256))
+
+
+### Dependencies
+
+* Update dependency com.google.http-client:google-http-client to v1.30.0 ([#261](https://github.com/googleapis/google-auth-library-java/pull/261))
+* Update dependency com.google.http-client:google-http-client to v1.29.2 ([#259](https://github.com/googleapis/google-auth-library-java/pull/259))
+* Update dependency org.sonatype.plugins:nexus-staging-maven-plugin to v1.6.8 ([#257](https://github.com/googleapis/google-auth-library-java/pull/257))
+* Update to latest app engine SDK version ([#258](https://github.com/googleapis/google-auth-library-java/pull/258))
+* Update dependency org.apache.maven.plugins:maven-source-plugin to v3.1.0 ([#254](https://github.com/googleapis/google-auth-library-java/pull/254))
+* Update dependency org.jacoco:jacoco-maven-plugin to v0.8.4 ([#255](https://github.com/googleapis/google-auth-library-java/pull/255))
+* Update dependency org.apache.maven.plugins:maven-jar-plugin to v3.1.2 ([#252](https://github.com/googleapis/google-auth-library-java/pull/252))
+* Update dependency org.apache.maven.plugins:maven-source-plugin to v2.4 ([#253](https://github.com/googleapis/google-auth-library-java/pull/253))
+
+
+### Documentation
+
+* Javadoc publish kokoro job uses docpublisher ([#243](https://github.com/googleapis/google-auth-library-java/pull/243))
+
+
+## [0.15.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.14.0...v0.15.0) (2019-03-27)
+
+
+### Bug Fixes
+
+* createScoped: make overload call implementation ([#229](https://github.com/googleapis/google-auth-library-java/pull/229))
+
+
+### Reverts
+
+* Add back in deprecated methods in ServiceAccountJwtAccessCredentials ([#238](https://github.com/googleapis/google-auth-library-java/pull/238))
+
+
+## [0.14.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.13.0...v0.14.0) (2019-03-26)
+
+
+### Bug Fixes
+
+* update default metadata url ([#230](https://github.com/googleapis/google-auth-library-java/pull/230))
+* Remove deprecated methods ([#190](https://github.com/googleapis/google-auth-library-java/pull/190))
+* Update Sign Blob API ([#232](https://github.com/googleapis/google-auth-library-java/pull/232))
+
+
+### Dependencies
+
+* Upgrade http client to 1.29.0. ([#235](https://github.com/googleapis/google-auth-library-java/pull/235))
+* update deps ([#234](https://github.com/googleapis/google-auth-library-java/pull/234))
+
+
+## [0.13.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.12.0...v0.13.0) (2019-01-17)
+
+
+### Bug Fixes
+
+* Use OutputStream directly instead of PrintWriter ([#220](https://github.com/googleapis/google-auth-library-java/pull/220))
+* Improve log output when detecting GCE ([#214](https://github.com/googleapis/google-auth-library-java/pull/214))
+
+
+### Features
+
+* Overload GoogleCredentials.createScoped with variadic arguments ([#218](https://github.com/googleapis/google-auth-library-java/pull/218))
+
+
+### Dependencies
+
+* Update google-http-client version, guava, and maven surefire plugin ([#221](https://github.com/googleapis/google-auth-library-java/pull/221))
+
+
+## [0.12.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.11.0...v0.12.0) (2018-12-19)
+
+
+### Bug Fixes
+
+* Show error message in case of problems with getting access token ([#206](https://github.com/googleapis/google-auth-library-java/pull/206))
+* Add note about `NO_GCE_CHECK` to metadata 404 error message ([#205](https://github.com/googleapis/google-auth-library-java/pull/205))
+
+
+### Features
+
+* Add ImpersonatedCredentials ([#211](https://github.com/googleapis/google-auth-library-java/pull/211))
+* Add option to suppress end user credentials warning. ([#207](https://github.com/googleapis/google-auth-library-java/pull/207))
+
+
+### Dependencies
+
+* Update google-http-java-client dependency to 1.27.0 ([#208](https://github.com/googleapis/google-auth-library-java/pull/208))
+
+
+### Documentation
+
+* README grammar fix ([#192](https://github.com/googleapis/google-auth-library-java/pull/192))
+* Add unstable badge to README ([#184](https://github.com/googleapis/google-auth-library-java/pull/184))
+* Update README with instructions on installing the App Engine SDK and running the tests ([#209](https://github.com/googleapis/google-auth-library-java/pull/209))
+
+
+## [0.11.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.10.0...v0.11.0) (2018-08-23)
+
+
+### Bug Fixes
+
+* Update auth token urls (#174)
+
+
+### Dependencies
+
+* Update dependencies (guava) (#170)
+* Bumping google-http-client version to 1.24.1 (#171)
+
+
+### Documentation
+
+* Documentation for ComputeEngineCredential signing. (#176)
+* Fix README link (#169)
+
+
+## [0.10.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.9.1...v0.10.0) (2018-06-12)
+
+
+### Bug Fixes
+
+* Read token_uri from service account JSON (#160)
+* Log warning if default credentials uses a user token from gcloud sdk (#166)
+
+
+### Features
+
+* Add OAuth2Credentials#refreshIfExpired() (#163)
+* ComputeEngineCredentials implements ServiceAccountSigner (#141)
+
+
+### Documentation
+
+* Versionless Javadocs (#164)
+* Fix documentation for `getAccessToken()` returning cached value (#162)
+
+
+## [0.9.1](https://www.github.com/googleapis/google-auth-library-java/compare/v0.9.0...v0.9.1) (2018-04-09)
+
+
+### Features
+
+* Add caching for JWT tokens (#151)
+
+
+## [0.9.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.8.0...v0.9.0) (2017-11-02)
+
+
+### Bug Fixes
+
+* Fix NPE deserializing ServiceAccountCredentials (#132)
+
+
+### Features
+
+* Surface cleanup (#136)
+* Providing a method to remove CredentialsChangedListeners (#130)
+* Implemented in-memory TokenStore and added opportunity to save user credentials into file (#129)
+
+
+### Documentation
+
+* Fixes comment typos. (#131)
+
+
+## [0.8.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.7.1...v0.8.0) (2017-09-08)
+
+
+### Bug Fixes
+
+* Extracting the project_id field from service account JSON files (#118)
+* Fixing an Integer Overflow Issue (#121)
+* use metadata server to get credentials for GAE 8 standard environment (#122)
+
+
+### Features
+
+* Switch OAuth2 HTTP surface to use builder pattern (#123)
+* Add builder pattern to AppEngine credentials (#125)
+
+
+### Documentation
+
+* Fix API Documentation link rendering (#112)
+
+
+## [0.7.1](https://www.github.com/googleapis/google-auth-library-java/compare/v0.7.0...v0.7.1) (2017-07-14)
+
+
+### Bug Fixes
+
+* Mitigate occasional failures in looking up Application Default Credentials on a Google Compute Engine (GCE) Virtual Machine (#110)
+
+
+## [0.7.0](https://www.github.com/googleapis/google-auth-library-java/compare/v0.6.1...v0.7.0) (2017-06-06)
+
+
+### Bug Fixes
+
+* Retry HTTP errors in `ServiceAccountCredentials.refreshAccessToken()` to avoid propagating failures (#100 addresses #91)
+
+
+### Features
+
+* Add `GoogleCredentials.createDelegated()` method to allow using domain-wide delegation with service accounts (#102)
+* Allow bypassing App Engine credential check using environment variable, to allow Application Default Credentials to detect GCE when running on GAE Flex (#103)