Update podspec and README

Author: Ernesto Rivera

NBUImagePicker.podspec

@@ -20,7 +20,7 @@ Pod::Spec.new do |s|
     s.requires_arc  = true
     s.preserve_paths = "README.md", "NOTICE"
 
-    s.dependency 'NBUKit',      '>= 2.2.2'
+    s.dependency 'NBUKit',      '>= 2.3.0'
 
     s.subspec 'Base' do |sub|
         sub.source_files  = 'Source/*.{h,m}'

README.md

@@ -14,7 +14,7 @@ _Uses [NBUCore](https://github.com/CyberAgent/iOS-NBUCore) and [NBUKit](https://
 
 ## Demo
 
-There is a PickerDemo project included in the repository and can also be tried online [here](https://app.io/hOkuyK).
+A demo project is [included](Demo) in the repository.
 
 ## Features