message: fix(deps): Update express mw to latest graphql-playground-html
  `graphql-playground-middleware-express` `package.json` should now point to the latest version
diff: "typescript": "2.6.2"
  },
  "dependencies": {
  - "graphql-playground-html": "1.6.12"
  + "graphql-playground-html": "1.6.13"
  },
  "typings": "dist/index.d.ts",
  "typescript": {
  