Fix for targetFeeds in reactions()->addChild

Merge pull request GetStream#86 from GetStream/feature/replace-abando…

…ned-packages

upgrade dependencies, drop php5.x support, update tests

Update CHANGELOG

prepare release

Merge pull request GetStream#76 from GetStream/task/release-3.0

Task/release 3.0

prepare release

Merge pull request GetStream#71 from GetStream/feature/add-user-sessi…

…on-token-support

Add support for user session tokens

Update CHANGELOG

Merge pull request GetStream#64 from GetStream/feature/personalization

Collections and Personalization added