Use correct version for php utils and remove repository

Author: joelwurtz

composer.json

@@ -6,7 +6,7 @@
         "symfony/options-resolver": "^2.7",
         "php-http/httplug": "^1.0@dev",
         "php-http/message-factory": "dev-master as 0.1.1",
-        "php-http/utils": "dev-master"
+        "php-http/utils": "^0.1@dev"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8",
@@ -21,10 +21,6 @@
         }
     },
     "repositories": [
-        {
-            "type": "vcs",
-            "url": "https://github.com/php-http/utils"
-        },
         {
             "type": "vcs",
             "url": "https://github.com/joelwurtz/adapter-integration-tests"