Bump yarn from 1.17.3 to 1.22.0

Bumps [yarn](https://github.com/yarnpkg/yarn) from 1.17.3 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@v1.17.3...v1.22.0)

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

Author: dependabot[bot]

package.json

@@ -33,6 +33,6 @@
         "tslint": "5.10.0",
         "typescript": "2.9.2",
         "typescript-eslint-parser": "16.0.0",
-        "yarn": "^1.17.3"
+        "yarn": "^1.22.0"
     }
 }

yarn.lock

@@ -8546,7 +8546,7 @@ yarn-global@^1.1.0:
   dependencies:
     user-home "^2.0.0"
 
-yarn@^1.17.3:
-  version "1.17.3"
-  resolved "https://registry.yarnpkg.com/yarn/-/yarn-1.17.3.tgz#60e0b77d079eb78e753bb616f7592b51b6a9adce"
-  integrity sha512-CgA8o7nRZaQvmeF/WBx2FC7f9W/0X59T2IaLYqgMo6637wfp5mMEsM3YXoJtKUspnpmDJKl/gGFhnqS+sON7hA==
+yarn@^1.22.0:
+  version "1.22.0"
+  resolved "https://registry.yarnpkg.com/yarn/-/yarn-1.22.0.tgz#acf82906e36bcccd1ccab1cfb73b87509667c881"
+  integrity sha512-KMHP/Jq53jZKTY9iTUt3dIVl/be6UPs2INo96+BnZHLKxYNTfwMmlgHTaMWyGZoO74RI4AIFvnWhYrXq2USJkg==