Bump codesniffer

Author: barryvdh

composer.json

@@ -29,7 +29,7 @@
         "guzzle/plugin-mock": "~3.1",
         "mockery/mockery": "~0.8",
         "phpunit/phpunit": "~3.7.0",
-        "squizlabs/php_codesniffer": "~1.4"
+        "squizlabs/php_codesniffer": "~1.5"
     },
     "extra": {
         "branch-alias": {