Update package.json

As been the recent issue with many users, the project fails with current dependencies. So, I'm updating the already installed dependencies to the latest versions, and adding `cire-js` to 2.6.5 (as it currecntly works well with latest gatsby release) as the project's inner node dependencies demand it

Author: waleedshkt

package.json

@@ -8,10 +8,11 @@
  "serve": "gatsby serve"
  },
  "dependencies": {
- "firebase": "^5.6.0",
- "gatsby": "^2.0.33",
- "react": "^16.5.1",
- "react-dom": "^16.5.1",
- "recompose": "^0.30.0"
+ "firebase": "^6.0.2",
+ "gatsby": "^2.4.3",
+ "react": "^16.8.6",
+ "react-dom": "^16.8.6",
+ "recompose": "^0.30.0",
+ "core-js": "^2.6.5"
  }
 }