fix(deps): update dependency graphql-playground-middleware-express to v1.5.8

Author: renovate-bot

Diff for: package.json

@@ -47,7 +47,7 @@
     "express": "^4.16.3",
     "graphql": "^0.11.0 || ^0.12.0 || ^0.13.0",
     "graphql-import": "^0.4.5",
-    "graphql-playground-middleware-express": "1.5.7",
+    "graphql-playground-middleware-express": "1.5.8",
     "graphql-playground-middleware-lambda": "1.4.3",
     "graphql-subscriptions": "^0.5.8",
     "graphql-tools": "^2.23.1",

Diff for: yarn.lock

@@ -563,9 +563,9 @@ graphql-playground-html@1.5.5:
   dependencies:
     graphql-config "2.0.0"
 
-graphql-playground-middleware-express@1.5.7:
-  version "1.5.7"
-  resolved "https://registry.yarnpkg.com/graphql-playground-middleware-express/-/graphql-playground-middleware-express-1.5.7.tgz#a07418791d9f3728b2bda18fc2c6edcaf997cc93"
+graphql-playground-middleware-express@1.5.8:
+  version "1.5.8"
+  resolved "https://registry.yarnpkg.com/graphql-playground-middleware-express/-/graphql-playground-middleware-express-1.5.8.tgz#e7d28ad3ec4a5e102be57b76742d83588631365b"
   dependencies:
     graphql-playground-html "1.5.5"