Bump prettier from 2.1.2 to 2.2.1

Bumps [prettier](https://github.com/prettier/prettier) from 2.1.2 to 2.2.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.1.2...2.2.1)

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -16140,9 +16140,9 @@
       "integrity": "sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks="
     },
     "prettier": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.1.2.tgz",
-      "integrity": "sha512-16c7K+x4qVlJg9rEbXl7HEGmQyZlG4R9AgP+oHKRMsMsuk8s+ATStlf1NpDqyBI1HpVyfjLOeMhH2LvuNvV5Vg=="
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.2.1.tgz",
+      "integrity": "sha512-PqyhM2yCjg/oKkFPtTGUojv7gnZAoG80ttl45O6x2Ug/rMJw4wcc9k6aaf2hibP7BGVCCM33gZoGjyvt9mm16Q=="
     },
     "pretty-bytes": {
       "version": "5.4.1",

package.json

@@ -27,7 +27,7 @@
     "react-helmet": "^6.1.0"
   },
   "devDependencies": {
-    "prettier": "2.1.2"
+    "prettier": "2.2.1"
   },
   "keywords": [
     "gatsby"