chore: update changelog with 0.2.0 release

CHANGELOG.md

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+## 0.2.0 (2021-01-04)
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+
+### Bug Fixes
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+* **changelog**: raise no error when output is set to stdout and `CHANGELOG.md` does not exist ([ba54c827](https:/github.com/zbindenren/cc/commit/ba54c827d89676615c76700ddd6912fdd54e4c7c))
+* **changelog**: stage changelog file if necessary ([0bdd1106](https:/github.com/zbindenren/cc/commit/0bdd11060bcd34ecf1678af86c55f8ba95e63c38))
+* **changelog**: typo in error message ([30cc4d88](https:/github.com/zbindenren/cc/commit/30cc4d88cd548532866fa0331394201058080888))
+* **changelog**: when overriding release version created tag was not overridden ([e185c32b](https:/github.com/zbindenren/cc/commit/e185c32bf61a0839b9bf044b4dc4cec4e0b878c2))
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+
+### New Features
+
+* **changelog**: add github markdown support ([a1f6009e](https:/github.com/zbindenren/cc/commit/a1f6009ea70b23b6c2605c116139b15cd7194c81))
+* **common**: add `config.Read` method to unmarshal config from `io.Reader` ([aecbc18b](https:/github.com/zbindenren/cc/commit/aecbc18b6173bf5b1fb1da321fb20af9720c759d))
+* **common**: add command to create a markdown changelog file ([b874c814](https:/github.com/zbindenren/cc/commit/b874c814d95f76a77e7ff7de45426bd1c3a3db46))
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