Drop Zend Framework library support

Removed Zend Framework library support

Author: wdalmut

composer.json

@@ -4,10 +4,7 @@
     "description": "Send your app metrics to InfluxDB",
     "require": {
          "php": ">=5.4",
-         "guzzlehttp/guzzle": "~4|~5|~6",
-         "zendframework/zend-stdlib": "~2",
-         "zendframework/zend-filter": "~2",
-         "zendframework/zend-servicemanager": "~2"
+         "guzzlehttp/guzzle": "~4|~5|~6"
     },
     "require-dev": {
         "phpunit/phpunit": "4.*",