Bump webonyx/graphql-php version

Only in 0.11 version, custom scalar can accept description

Author: mcg-web

.travis.yml

@@ -6,9 +6,8 @@ matrix:
     fast_finish: true
     include:
         - php: 5.5
-          env: GRAPHQLPHP_VERSION=0.10.*
-        - php: 5.6
-          env: GRAPHQLPHP_VERSION=0.10.*
+#        - php: 5.6
+#          env: GRAPHQLPHP_VERSION=0.10.*
         - php: 5.6
         - php: 7.0
         - php: 7.1

composer.json

@@ -16,7 +16,7 @@
     },
     "require": {
         "php": "^5.4|~7.0",
-        "webonyx/graphql-php": "^0.10.0 || ^0.11.0"
+        "webonyx/graphql-php": "^0.11.0"
     },
     "require-dev": {
         "fabpot/php-cs-fixer": "^1.11",