doc: update release notes for v1.13.0 (#3985)

Author: coryan

CHANGELOG.md

@@ -1,6 +1,89 @@
 # Changelog
 
-## TBD
+## v1.14.0 - TBD
+
+## v1.13.0 - 2020-05
+
+**NOTICE:** This release aligns all the version numbers for Bigtable, Storage,
+the common libraries, and the repository itself. From this point on all
+releases will include a single version number. Note that there is a gap in the
+version numbers for Bigtable and the repository changes from v0.21.0 to
+v**1**.13.0
+
+**BREAKING CHANGES**
+
+* The common library inlined namespace changed to `v0` to `v1`, moving all the
+  symbols from `google::cloud::v0` to `google::cloud::v1`. Applications that
+  explicitly referred to the inlined namespace would be affected by this change.
+  That is, code that uses `google::cloud::v0::Foo` instead of
+  `google::cloud::Foo` would need to be modified. We apologize if this has
+  impacted you, and recommend that applications do not refer to the inlined
+  namespace in the future.
+
+### Bigtable
+
+**BREAKING CHANGES**
+
+See above regarding the common library inlined namespace.
+
+**OTHER CHANGES**
+
+* cleanup: the library now links against the common libraries included in this
+  repository, applications developers should not install the standalone common
+  libraries in the (now archived) google-cloud-cpp-common repository.
+* feat: compile bigtable benchmarks with Bazel (#3884)
+* feat: implement table level IAM policy for bigtable(async) (#3829)
+* feat: implement table level IAM policy for bigtable (#3751)
+* refactor: synchronize version numbers for all libraries (#3710)
+* feat: change READMEs and quickstart programs (#3690)
+  The `google/cloud/bigable/quickstart/` directory contains a sample project
+  for CMake and Bazel that uses the Cloud Bigtable C++ client library as we
+  expect application developers would.
+
+### Storage
+
+**BREAKING CHANGES**
+
+See above regarding the common library inlined namespace.
+
+* fix!: use correct type for generation numbers (#3870) This changes the type of
+  two fields from `google::cloud::optional<long>` to
+  `google::cloud::optional<std::int64_t>`. With MSVC this is not a backwards
+  compatible change (storing the result of `.value()` into a `long` now loses
+  precision). However, on that platform the fields were not usable, they could
+  not store the values that are typically generated by the production
+  environment. We apologize to any customers affected by this change, but we
+  think it is unlikely that anybody used the field on that platform.
+
+**OTHER CHANGES**
+
+* cleanup: the library now links against the common libraries included in this
+  repository, applications developers should not install the standalone common
+  libraries in the (now archived) google-cloud-cpp-common repository.
+* feat: implement POST policy signatures. Applications can use the Google Cloud
+  Storage C++ client library to create
+  [POST objects](https://cloud.google.com/storage/docs/xml-api/post-object),
+  which allow uploading using HTML forms.
+* feat: change READMEs and quickstart programs (#3690)
+  The `google/cloud/bigable/quickstart/` directory contains a sample project
+  for CMake and Bazel that uses the Cloud Bigtable C++ client library as we
+  expect application developers would.
+* fix: use network to check if running inside Google (#3959) With this change
+  applications running on Google App Engine Flex (GAEF), Google Kubernetes
+  Engine (GKE), or Cloud Run can use the Google Default Credentials.
+* fix: build problems on MSVC x86 (#3916)
+* fix: do not use CURL_SHARE features (#3860)
+* chore: upgrade libcurl to v7.69.1 (#3851)
+
+### Common Libraries
+
+**BREAKING CHANGES**
+
+See above regarding the common library inlined namespace.
+
+**OTHER CHANGES**
+
+No other interesting changes in the common libraries with this release.
 
 ## v0.21.0 - 2020-04