update podspec

CocoaMQTT.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name        = "CocoaMQTT"
-  s.version     = "1.0.17"
+  s.version     = "1.0.18"
   s.summary     = "MQTT v3.1.1 client library for iOS and OS X written with Swift 3"
   s.homepage    = "https://github.com/emqtt/CocoaMQTT"
   s.license     = { :type => "MIT" }
@@ -11,7 +11,7 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = "8.0"
   s.tvos.deployment_target = "9.0"
   # s.watchos.deployment_target = "2.0"
-  s.source   = { :git => "https://github.com/emqtt/CocoaMQTT.git", :tag => "1.0.17"}
+  s.source   = { :git => "https://github.com/emqtt/CocoaMQTT.git", :tag => "1.0.18"}
   s.source_files = "Source/{*.h}", "Source/*.swift"
   s.dependency "CocoaAsyncSocket", "~> 7.5.1"
   s.dependency "SwiftyTimer", "~> 2.0.0"