DX: deprecated ProphecyTrait in favour of the one coming from Prophecy\PhpUnit package.

src/Bundle/ChillMainBundle/Test/ProphecyTrait.php

@@ -17,6 +17,7 @@ namespace Chill\MainBundle\Test;
  * **Usage : ** You must set up trait with `setUpTrait` before use
  * and use tearDownTrait after usage.
  *
+ * @deprecated use @see{\Prophecy\PhpUnit\ProphecyTrait} instead
  * @codeCoverageIgnore
  */
 trait ProphecyTrait