changelog 1.0.0 update (#102)
changelog 1.0.0 update (#102)

* update CHANGELOG with 1.0.0 notes

* change header to bullets

relayrides/objective-c-sdk,relayrides/objective-c-sdk,optimizely/objective-c-sdk,relayrides/objective-c-sdk,optimizely/objective-c-sdk,optimizely/objective-c-sdk,optimizely/objective-c-sdk,relayrides/objective-c-sdk