Work around packagist bug

GrahamCampbell · GrahamCampbell · commit d966a8d154ec · 2015-01-28T20:27:38.000Z
diff --git a/composer.json b/composer.json
@@ -17,7 +17,7 @@
         "parse/php-sdk": "~1.0"
     },
     "require-dev": {
-        "graham-campbell/testbench": "~2.0"
+        "graham-campbell/testbench": "dev-master"
     },
     "autoload": {
         "psr-4": {
