message: update gatsby packages in example
diff: "@emotion/react": "^11.1.4",
  "@emotion/styled": "^11.0.0",
  "framer-motion": "^4.0.0",
  - "gatsby": "^2.29.3",
  + "gatsby": "^3.3.0",
  "gatsby-image": "^2.8.0",
  - "gatsby-plugin-manifest": "^2.9.1",
  - "gatsby-plugin-offline": "^3.7.1",
  - "gatsby-plugin-react-helmet": "^3.7.0",
  - "gatsby-plugin-sharp": "^2.11.2",
  - "gatsby-source-filesystem": "^2.8.1",
  - "gatsby-transformer-sharp": "^2.9.0",
  + "gatsby-plugin-manifest": "^3.3.0",
  + "gatsby-plugin-offline": "^4.3.0",
  + "gatsby-plugin-react-helmet": "^4.3.0",
  + "gatsby-plugin-sharp": "^3.3.0",
  + "gatsby-source-filesystem": "^3.3.0",
  + "gatsby-transformer-sharp": "^3.3.0",
  "prop-types": "^15.7.2",
  "react": "^17.0.1",
  "react-dom": "^17.0.1",
  