Merge pull request #755 from stevenedds/master

update cocoapods url

README.md

@@ -87,7 +87,7 @@ If you are having questions or problems, you should:
 
  - Make sure you are using the latest version of the library. Check the [**release-section**](https://github.com/danielgindi/ios-charts/releases).
  - Study the Android version's [**Documentation-Wiki**](https://github.com/PhilJay/MPAndroidChart/wiki)
- - Study the (Still incomplete [![Doc-Percent](https://img.shields.io/cocoapods/metrics/doc-percent/Charts.svg)](http://cocoadocs.org/docsets/Charts/2.2.0)) [**Pod-Documentation**](http://cocoadocs.org/docsets/Charts/2.2.0)
+ - Study the (Still incomplete [![Doc-Percent](https://img.shields.io/cocoapods/metrics/doc-percent/Charts.svg)](http://cocoadocs.org/docsets/Charts/2.2.2)) [**Pod-Documentation**](http://cocoadocs.org/docsets/Charts/2.2.2)
  - Search or open questions on [**stackoverflow**](http://stackoverflow.com/questions/tagged/ios-charts) with the `ios-charts` tag
  - Search [**known issues**](https://github.com/danielgindi/ios-charts/issues) for your problem (open and closed)
  - Create new issues (please **search known issues before**, do not create duplicate issues)