chore: update changelog [skip ci]

Author: adhocore

CHANGELOG.md

@@ -0,0 +1,9 @@
+## [0.2.0] 2018-08-21 14:08:52 UTC
+
+- [a75c76e](https://github.com/adhocore/php-cli/commit/a75c76e) feat(cmd.option): support multiline desc and indent them properly on help (Jitendra Adhikari)
+- [7b04d18](https://github.com/adhocore/php-cli/commit/7b04d18) refactor: readme > README (Jitendra Adhikari)
+- [6e79204](https://github.com/adhocore/php-cli/commit/6e79204) docs: exceptions preview (Jitendra Adhikari)
+- [c5ffb12](https://github.com/adhocore/php-cli/commit/c5ffb12) test: 100% cov ftw (Jitendra Adhikari)
+- [92f41ba](https://github.com/adhocore/php-cli/commit/92f41ba) feat(output.helper): add print trace (Jitendra Adhikari)
+- [7b5080e](https://github.com/adhocore/php-cli/commit/7b5080e) refactor(app): output helper instantiation and print trace (Jitendra Adhikari)
+