1.2.0

The CocoaMQTT v1.2.0 is available now!

Features:

• Support swift5 & Xcode 10.2
• Support to subscribe multiple topics at once
• Support to re-delivery the un-acknowledgment messages

Enhancements:

• Introduced the CocoaMQTTTimer (#246), which means the Timer doesn't block the dispatchQueue now
• Change the Frame datatype to be a struct
• Fix the memory leak in the message publish functions
• Fix setting the dup/retained/qos flag error
• More testcases