v0.2.0

10ba9aa Update dependencies. (#21)
afb7e54 Add composer.lock file. (#20)
59eaab8 Update command description and ouput. (#19)
6ea2f9e Add psr4 namespace (#18)
8b789ec Add console extend plugin example (#17)
a503bf0 Update readme remove --no-dev. (#16)
2febd00 Update dependencies as require. (#15)
0bcb845 Update extend-extension-manager class. (#14)
3eb2872 Extract package validation as class. (#13)