Update README.md

Author: zacwest

README.md

@@ -235,10 +235,10 @@ If any of your composed strings contain a `<` character without being in a tag,
 ZSWTaggedString is available through [CocoaPods](http://cocoapods.org). Add the following line to your Podfile:
 
 ```ruby
-pod "ZSWTaggedString", "~> 4.0"
-pod "ZSWTaggedString/Swift", "~> 4.0" # Optional, for Swift support
+pod "ZSWTaggedString", "~> 4.1"
+pod "ZSWTaggedString/Swift", "~> 4.1" # Optional, for Swift support
 ```
 
 ## License
 
-ZSWTaggedString is available under the [MIT license](https://github.com/zacwest/ZSWTaggedString/blob/master/LICENSE). If you are contributing via pull request, please include an appropriate test for the bug you are fixing or feature you are adding.
+ZSWTaggedString is available under the [MIT license](https://github.com/zacwest/ZSWTaggedString/blob/master/LICENSE). If you are contributing via pull request, please include an appropriate test for the bug you are fixing or feature you are adding.