Update CONTRIBUTING.md

Author: lucasromanomr

CONTRIBUTING.md

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 GitHub Issues is for reporting bugs, discussing features and general feedback in **Cache**. Be sure to check our [documentation](http://cocoadocs.org/docsets/Cache), [FAQ](https://github.com/hyperoslo/Cache/wiki/FAQ) and [past issues](https://github.com/hyperoslo/Cache/issues?state=closed) before opening any new issues.
 
 If you are posting about a crash in your application, a stack trace is helpful, but additional context, in the form of code and explanation, is necessary to be of any use.
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