Version 0.2.0

a75c76e feat(cmd.option): support multiline desc and indent them properly on help (Jitendra Adhikari)
7b04d18 refactor: readme > README (Jitendra Adhikari)
6e79204 docs: exceptions preview (Jitendra Adhikari)
c5ffb12 test: 100% cov ftw (Jitendra Adhikari)
92f41ba feat(output.helper): add print trace (Jitendra Adhikari)
7b5080e refactor(app): output helper instantiation and print trace (Jitendra Adhikari)