Docs: Changelog. [skip ci]

CHANGELOG.md

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 Changelog
 =========
 
+## [0.5.2](https://github.com/cksource/mgit2/compare/v0.5.1...v0.5.2) (2017-07-04)
+
+### Bug fixes
+
+* Fixed various minor issues with the commands. Introduced missing tests. Closes [#31](https://github.com/cksource/mgit2/issues/31). Closes [#41](https://github.com/cksource/mgit2/issues/41). Closes [#3](https://github.com/cksource/mgit2/issues/3). Closes [#43](https://github.com/cksource/mgit2/issues/43). ([5751eb7](https://github.com/cksource/mgit2/commit/5751eb7))
+
+### Other changes
+
+* Shortened hashes to 7-char version in the `save-hashes` command. Closes [#47](https://github.com/cksource/mgit2/issues/47). ([73990c8](https://github.com/cksource/mgit2/commit/73990c8))
+
+
 ## [0.5.1](https://github.com/cksource/mgit2/compare/v0.5.0...v0.5.1) (2017-02-01)
 
 ### Bug fixes