Update 'NWWebSocket' to 0.3.0 in Cartfile

Author: danielrbrowne

Cartfile

@@ -1,3 +1,3 @@
 github "ashleymills/Reachability.swift" ~> 5.0.0
 github "jedisct1/swift-sodium" == 0.8.0
-github "pusher/NWWebSocket" ~> 0.2.1
+github "pusher/NWWebSocket" ~> 0.3.0

Cartfile.resolved

@@ -1,3 +1,3 @@
 github "ashleymills/Reachability.swift" "v5.0.0"
 github "jedisct1/swift-sodium" "0.8.0"
-github "pusher/NWWebSocket" "0.2.1"
+github "pusher/NWWebSocket" "0.3.0"