Version bump + CHANGELOG update (Flagsmith#34)

Release/3.0.0 (Flagsmith#28)

* Bump version to 3.0.0

* Update default API URL

minor updated

* adding support for streams from storage

* breaking change in storing values
* implementing equatable
* config: new isDebug attr for toggle loging to console

Multiple storages

Storage security with password
Breaking changes in config
Remove sambas