Set mocha version

Author: dsanel

README.md

@@ -4,7 +4,6 @@ Mongoose Delete Plugin
 mongoose-delete is simple and lightweight plugin that enables soft deletion of documents in MongoDB. This code is based on [riyadhalnur's](https://github.com/riyadhalnur) plugin [mongoose-softdelete](https://github.com/riyadhalnur/mongoose-softdelete).
 
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 ## Features
  - [Add __delete()__ method on document (do not override standard __remove()__ method)](#simple-usage)