Bump stylelint-config-standard from 20.0.0 to 21.0.0

Bumps [stylelint-config-standard](https://github.com/stylelint/stylelint-config-standard) from 20.0.0 to 21.0.0.
- [Release notes](https://github.com/stylelint/stylelint-config-standard/releases)
- [Changelog](https://github.com/stylelint/stylelint-config-standard/blob/master/CHANGELOG.md)
- [Commits](stylelint/stylelint-config-standard@20.0.0...21.0.0)

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

package.json

@@ -92,8 +92,8 @@
     "regenerator-runtime": "~0.13.7",
     "rimraf": "~3.0.0",
     "styled-components": "~5.2.0",
-    "stylelint": "~13.11.0",
-    "stylelint-config-standard": "~20.0.0",
+    "stylelint": "~13.12.0",
+    "stylelint-config-standard": "~21.0.0",
     "stylelint-config-styled-components": "~0.1.0",
     "stylelint-processor-styled-components": "~1.10.0",
     "uuid": "~8.3.2",