Define versions in Cartfile and update dependencies (#212)

Some of this project's dependencies released Swift 5 versions which cannot be compiled using previous Xcode/Swift versions.  Specify dependency versions in Cartfile and update CocoaPods dependencies so those breaking versions aren't used.

Author: cowgp

Cartfile

@@ -1,4 +1,4 @@
-github "krzyzanowskim/CryptoSwift"
-github "ashleymills/Reachability.swift"
-github "icanzilb/TaskQueue"
-github "daltoniam/Starscream"
+github "krzyzanowskim/CryptoSwift" ~> 0.15.0
+github "ashleymills/Reachability.swift" == 4.3.0
+github "icanzilb/TaskQueue" ~> 1.1.1
+github "daltoniam/Starscream" == 3.0.6

Cartfile.resolved

@@ -1,4 +1,4 @@
-github "ashleymills/Reachability.swift" "v4.1.0"
-github "daltoniam/Starscream" "3.0.5"
+github "ashleymills/Reachability.swift" "v4.3.0"
+github "daltoniam/Starscream" "3.0.6"
 github "icanzilb/TaskQueue" "1.1.1"
-github "krzyzanowskim/CryptoSwift" "0.9.0"
+github "krzyzanowskim/CryptoSwift" "0.15.0"

PusherSwift.podspec

@@ -11,9 +11,9 @@ Pod::Spec.new do |s|
   s.requires_arc = true
   s.source_files = 'Sources/*.swift'
 
-  s.dependency 'CryptoSwift', '~> 0.9.0'
-  s.dependency 'ReachabilitySwift', '~> 4.1.0'
-  s.dependency 'TaskQueue', '~> 1.1.1'
+  s.dependency 'CryptoSwift', '~> 0.9'
+  s.dependency 'ReachabilitySwift', '4.3.0'
+  s.dependency 'TaskQueue', '~> 1.1'
   s.dependency 'Starscream', '~> 3.0.5'
 
   s.ios.deployment_target = '8.0'