Updated podspec to 0.9.0, updated readme

Author: louisdh

PanelKit.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'PanelKit'
-  s.version = '0.8.2'
+  s.version = '0.9.0'
   s.license = 'MIT'
   s.summary = 'A UI framework that enables panels on iOS.'
   s.homepage = 'https://github.com/louisdh/panelkit'

README.md

@@ -94,14 +94,14 @@ Typically the ```PanelManager``` protocol is implemented on a ```UIViewControlle
 To install, add the following line to your ```Podfile```:
 
 ```ruby
-pod 'PanelKit', '~> 0.8'
+pod 'PanelKit', '~> 0.9'
 ```
 
 ### [Carthage](https://github.com/Carthage/Carthage)
 To install, add the following line to your ```Cartfile```:
 
 ```ruby
-github "louisdh/panelkit" ~> 0.8
+github "louisdh/panelkit" ~> 0.9
 ```
 Run ```carthage update``` to build the framework and drag the built ```PanelKit.framework``` into your Xcode project.