Merge pull request #420 from linchpin/renovate/slevomat-coding-standard-8.x

chore(deps): update dependency slevomat/coding-standard to ^8.20.0

Author: aaronware

composer.json

@@ -77,7 +77,7 @@
 		"phpstan/phpstan": "^1.12.28",
 		"phpstan/phpstan-deprecation-rules": "^1.2.1",
 		"phpstan/phpstan-phpunit": "^1.4.2",
-		"slevomat/coding-standard": "^8.19.1",
+		"slevomat/coding-standard": "^8.20.0",
 		"szepeviktor/phpstan-wordpress": "^1.3.5",
 		"wp-phpunit/wp-phpunit": "^6.8.2",
 		"yoast/phpunit-polyfills": "^4.0",