Fix tests by fixing behatch/contexts dependency

Author: abluchet

composer.json

@@ -33,7 +33,7 @@
         "behat/mink-browserkit-driver": "^1.3.1",
         "behat/mink-extension": "^2.2",
         "behat/symfony2-extension": "^2.1.1",
-        "behatch/contexts": "^3.1",
+        "behatch/contexts": "3.1.0",
         "doctrine/annotations": "^1.2",
         "doctrine/doctrine-bundle": "^1.8",
         "doctrine/orm": "^2.5.2",