Add 0.1.3 changelog entry

Author: eldruin

CHANGELOG.md

@@ -5,6 +5,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+...
+
+## [v0.1.3] - 2019-05-14
+
 ### Added
 
 - minf
@@ -81,6 +85,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 - Initial release
 
-[Unreleased]: https://github.com/japaric/libm/compare/v0.1.2...HEAD
+[Unreleased]: https://github.com/japaric/libm/compare/0.1.3...HEAD
+[v0.1.3]: https://github.com/japaric/libm/compare/v0.1.2...0.1.3
 [v0.1.2]: https://github.com/japaric/libm/compare/v0.1.1...v0.1.2
 [v0.1.1]: https://github.com/japaric/libm/compare/v0.1.0...v0.1.1