Merge pull request #55 from aasanchez/patch-1

require zip extension

composer.json

@@ -15,6 +15,7 @@
         }
     },
     "require": {
+        "ext-zip": "*",
         "guzzlehttp/guzzle": "~4.0|~5.0|~6.0",
         "symfony/console": "~2.3|~3.0",
         "symfony/process": "~2.3|~3.0"