Bump gatsby from 2.21.7 to 2.22.0

Bumps [gatsby](https://github.com/gatsbyjs/gatsby) from 2.21.7 to 2.22.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/compare/[email protected]@2.22.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

packages/www/package.json

@@ -13,7 +13,7 @@
     "@types/react-copy-to-clipboard": "^4.3.0",
     "@types/react-helmet": "^5.0.15",
     "babel-plugin-styled-components": "^1.10.7",
-    "gatsby": "^2.20.22",
+    "gatsby": "^2.22.0",
     "gatsby-plugin-manifest": "^2.3.6",
     "gatsby-plugin-mdx": "^1.2.6",
     "gatsby-plugin-react-helmet": "^3.3.1",