Revert "Leftover from c512c3eff682d8e696ebef5c97bdfda6a73877ac"

This reverts commit a267e5936f53d18aa20cf0de47fe055f80d280ab.
Revert "Bundle phpspec/prophecy and phpspec/prophecy-phpunit"

This reverts commit c512c3eff682d8e696ebef5c97bdfda6a73877ac.