Add support for the `type` field in PubNubMembershipMetadata (#194) #718

Job	Run time
Validate demo application	1m 29s
Validate package managers (CocoaPods)	5m 54s
Validate package managers (Swift Package Manager)	2m 16s
Validate .pubnub.yml	10s
Validations	3s
	9m 52s

Provide feedback