changes in travis - php version

Author: shopifychamp

composer.json

@@ -14,7 +14,7 @@
     "require": {
         "php": ">=7.0",
         "rdx/graphql-query" : "^1.1",
-        "guzzlehttp/guzzle": "^7.0",
+        "guzzlehttp/guzzle": "^6.3.1|^7.0.1",
         "phpunit/phpunit": "^6.5"
     },
     "autoload": {