graphql-ce-120: added missing dependency to composer json

Author: vitaliyboyko

app/code/Magento/StoreGraphQl/composer.json

@@ -4,7 +4,8 @@
     "type": "magento2-module",
     "require": {
         "php": "~7.1.3||~7.2.0",
-        "magento/framework": "*"
+        "magento/framework": "*",
+        "magento/module-store": "*"
     },
     "suggest": {
         "magento/module-graph-ql": "*",