Temporarily remove explicit dependency on Evenement to fix install

Author: clue

composer.json

@@ -12,7 +12,6 @@
     ],
     "require": {
         "php": ">=5.3",
-        "evenement/evenement": "~1.0|~2.0",
         "react/promise": "~1.0|~2.0",
         "react/socket-client": "0.3.*|0.4.*",
         "react/event-loop": "0.3.*|0.4.*"