Merge pull request #358 from GrahamCampbell/patch-1

Update composer.json

Author: Jamie Hannaford

composer.json

@@ -22,11 +22,11 @@
     },
     "require": {
         "php" : ">=5.3.3",
-        "guzzle/http" : "3.8.*@dev"
+        "guzzle/http" : "~3.8"
     },
     "require-dev" : {
-        "guzzle/guzzle": "dev-master",
-        "psr/log": "1.0.*",
+        "guzzle/guzzle": "~3.8",
+        "psr/log": "~1.0",
         "satooshi/php-coveralls": "0.6.*@dev"
     }
-}
+}