update podspec version to 0.5.0

Author: nfhipona

AutoCompleteTextField.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "AutoCompleteTextField"
-  s.version          = "0.4.1"
+  s.version          = "0.5.0"
   s.swift_version    = "5"
   s.platform         = :ios, '10.0'
   s.summary          = "TextField Subclass with auto completion feature."