Release version 1.2.0

Author: hoangtaiki

Refreshable.podspec

@@ -1,11 +1,11 @@
 Pod::Spec.new do |s|
   s.name = 'Refreshable'
-  s.version = '1.1.2'
+  s.version = '1.2.0'
   s.license = 'MIT'
   s.summary = 'Pull to refresh and load more function for UIScrollView'
   s.homepage = 'https://github.com/hoangtaiki/Refreshable'
   s.authors = { 'Hoangtaiki' => 'duchoang.vp@gmail.com' }
-  s.source = { :git => 'https://github.com/hoangtaiki/Refreshable.git', :tag => s.version }
+  s.source = { :git => 'https://github.com/hoangtaiki/Refreshable.git', :tag => s.version.to_s }
 
   s.requires_arc = true
   s.platform = :ios, "9.0"