Merge pull request #62 from Nyholm/patch-2

Fixed prefer-lowest build

Author: dbu

composer.json

@@ -13,7 +13,7 @@
     "require": {
         "php": ">=5.4",
         "php-http/httplug": "^1.0",
-        "php-http/message-factory": "^1.0",
+        "php-http/message-factory": "^1.0.2",
         "psr/log": "^1.0",
         "psr/cache": "^1.0",
         "php-http/client-common": "^1.0",