(POD SPEC UPDATE) update pod spec & readme

Author: jjimeno

JJStaggeredGridCollectionView.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'JJStaggeredGridCollectionView'
-  s.version          = '0.1.0'
+  s.version          = '0.2.0'
   s.summary          = 'A staggered UICollectionView grid layout.'
 
 # This description is used to generate tags and improve search results.
@@ -38,5 +38,4 @@ A staggered UICollectionView grid layout subclassing UICollectionViewFlowLayout,
 
   # s.public_header_files = 'Pod/Classes/**/*.h'
   s.frameworks = 'UIKit'
-  # s.dependency 'AFNetworking', '~> 2.3'
 end

README.md

@@ -34,6 +34,10 @@ open var footerReferenceSize: CGSize
 open var sectionInset: UIEdgeInsets
 ```
 
+To set the number of columns your layout has, just change
+```swift
+collectionviewLayout.numColumns = 3
+```
 ## Installation
 
 JJStaggeredGridCollectionView is available through [CocoaPods](http://cocoapods.org). To install