Update herbie requirement

Author: tbreuss

composer.json

@@ -7,7 +7,7 @@
     "license":"BSD-3-Clause",
     "require": {
         "php": ">=5.4.0",
-        "getherbie/herbie": "dev-master",
+        "getherbie/herbie": "^1.0.0",
         "getherbie/composer": "dev-master",
         "getherbie/plugin-simplecontact": "dev-master",
         "getherbie/plugin-simplesearch": "dev-master"