Merge pull request #329 from benbalter/dependabot/composer/yoast/phpunit-polyfills-tw-3.0

Update yoast/phpunit-polyfills requirement from ^2.0 to ^3.0

Author: benbalter

composer.json

@@ -15,7 +15,7 @@
     "wp-cli/wp-cli": "~2.4",
     "wp-coding-standards/wpcs": "^3.0",
     "php-coveralls/php-coveralls": "*",
-    "yoast/phpunit-polyfills": "^2.0"
+    "yoast/phpunit-polyfills": "^4.0"
   },
   "config": {
     "bin-dir": "bin",