Bump yarn from 1.13.0 to 1.22.0

Bumps [yarn](https://github.com/yarnpkg/yarn) from 1.13.0 to 1.22.0.
- [Release notes](https://github.com/yarnpkg/yarn/releases)
- [Changelog](https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md)
- [Commits](yarnpkg/yarn@v1.13.0...v1.22.0)

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

Author: dependabot[bot]

package-lock.json

@@ -28,6 +28,6 @@
         "inline-attachment": "^2.0.3",
         "npm": "^6.9.0",
         "simplemde": "^1.11.2",
-        "yarn": "^1.13.0"
+        "yarn": "^1.22.0"
     }
 }