allow hhvm-autoload 3.0

Summary: Pull Request resolved: #26

Differential Revision: D19798775

Pulled By: jjergus

fbshipit-source-id: 7c3d7625c6030477e2e7101b7e988f375c4df633

Author: jjergus

composer.json

@@ -14,6 +14,6 @@
         "hhvm/hhast": "^4.0",
         "hhvm/hacktest": "^2.0",
         "facebook/fbexpect": "^2.1.2",
-        "hhvm/hhvm-autoload": "^2.0"
+        "hhvm/hhvm-autoload": "^2.0|^3.0"
     }
 }