Fix error for podspec validation

Author: Bruce-pac

RxIGListKit.podspec

@@ -9,7 +9,7 @@
 Pod::Spec.new do |s|
   s.name             = 'RxIGListKit'
   s.version          = '1.0.0'
-  s.summary          = 'A short description of RxIGListKit.'
+  s.summary          = "A RxSwift wrapper for Instagram IGListKit."
 
 # This description is used to generate tags and improve search results.
 #   * Think: What does it do? Why did you write it? What is the focus?
@@ -18,7 +18,8 @@ Pod::Spec.new do |s|
 #   * Finally, don't worry about the indent, CocoaPods strips it!
 
   s.description      = <<-DESC
-TODO: Add long description of the pod here.
+  A RxSwift wrapper for Instagram IGListKit - A data-driven UICollectionView framework for building fast and flexible lists.
+  RxIGListKit bring IGListKit into Reactive world.
                        DESC
 
   s.homepage         = 'https://github.com/Bruce-pac/RxIGListKit'
@@ -29,6 +30,7 @@ TODO: Add long description of the pod here.
   # s.social_media_url = 'https://twitter.com/<TWITTER_USERNAME>'
 
   s.ios.deployment_target = '8.0'
+  s.swift_version = '5.0'
 
   s.source_files = 'RxIGListKit/Classes/**/*'