depend on hacktest 2.0 (#1)

depend on hacktest 2.0

Author: azjezz

composer.json

@@ -19,7 +19,7 @@
     },
     "require-dev": {
         "facebook/fbexpect": "^2.7",
-        "hhvm/hacktest": "^1.6",
+        "hhvm/hacktest": "^2.0",
         "hhvm/hhast": "^4.25"
     },
     "scripts": {