Remove authors section from README.
Remove authors section from README.

Since you can see contributors on github there's no need.
googleads/google-media-framework-ios,sambatech/player_sdk_ios,sambatech/player_sdk_ios,sambatech/player_sdk_ios,googleads/google-media-framework-ios,xswm1123/google-media-framework-ios,sambatech/player_sdk_ios