Merge pull request #6 from FreshMail/update-guzzle-library

update guzzlehttp library to newest version

Author: ankalagon

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": "^7.0",
         "ext-json":  "*",
-        "guzzlehttp/guzzle": "^6.3",
+        "guzzlehttp/guzzle": "~7.2",
         "monolog/monolog": "^1.24|^2.0",
         "psr/log": "^1.1",
         "psr/http-message": "^1.0",