Update changelog for version 2.0.1

Author: danmichaelo

CHANGELOG.md

@@ -8,6 +8,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 None yet
 
+## [2.0.1] - 2019-01-09
+
+### Fixed
+
+- Fixed strict comparison in `Field::mapSubFields()` to avoid matching `0`
+  to other subfields.
+
 ## [2.0.0] - 2018-10-23
 
 ### Added
@@ -76,7 +83,8 @@ None yet
 - `Record::fromString` now throws a `RecordNotFound` exception rather than an `ErrorException` exception if no record was found.
 - `Record::getType` now throws a `UnknownRecordType` exception rather than an `ErrorException`.
 
-[Unreleased]: https://github.com/scriptotek/php-marc/compare/v2.0.0...HEAD
+[Unreleased]: https://github.com/scriptotek/php-marc/compare/v2.0.1...HEAD
+[2.0.1]: https://github.com/scriptotek/php-marc/compare/v2.0.0...v2.0.1
 [2.0.0]: https://github.com/scriptotek/php-marc/compare/v1.0.1...v2.0.0
 [1.0.1]: https://github.com/scriptotek/php-marc/compare/v1.0.0...v1.0.1
 [1.0.0]: https://github.com/scriptotek/php-marc/compare/v0.3.2...v1.0.0