Update composer.json

Style fixes (Happyr#117)

 Applied fixes from StyleCI (Happyr#116)

Added changelog for 0.7.1 (Happyr#108)

Merge pull request Happyr#96 from Happyr/prepare

Prepare for 0.7

Merge pull request Happyr#88 from agencyanalytics/cleanError

Minor fix for error handling

Merge pull request Happyr#87 from Happyr/warnings

Added deprecated warnings

code style and url enpoint fix

Follow API spec, use POST when getting ac

Docs and user agent

simpler APIs and let the request clients be more transparent