message: chore: update readme's contributors and keywords
diff: "description": "GraphQL IDE for better development workflows (GraphQL Subscriptions, interactive docs & collaboration).",
  "contributors": [
  "Tim Suchanek <tim@graph.cool>",
  - "Johannes Schickling <johannes@graph.cool>"
  + "Johannes Schickling <johannes@graph.cool>",
  + "Mohammad Rajabifard <mo.rajbi@gmail.com>"
  ],
  "repository": "http://github.com/graphcool/graphql-playground.git",
  "license": "SEE LICENSE IN LICENSE",
  "build": "tsc",
  "prepublishOnly": "npm run build"
  },
  - "keywords": [],
  + "keywords": [
  + "graphql",
  + "graphiql",
  + "playground",
  + "graphcool"
  + ],
  "peerDependencies": {
  "express": "^4.16.2"
  },
  