Bump @fullhuman/postcss-purgecss from 1.3.0 to 2.0.5

Bumps [@fullhuman/postcss-purgecss](https://github.com/FullHuman/purgecss) from 1.3.0 to 2.0.5.
- [Release notes](https://github.com/FullHuman/purgecss/releases)
- [Changelog](https://github.com/FullHuman/purgecss/blob/master/CHANGELOG.md)
- [Commits](FullHuman/purgecss@v1.3.0...v2.0.5)

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

package.json

@@ -28,7 +28,7 @@
     "release": "np"
   },
   "dependencies": {
-    "@fullhuman/postcss-purgecss": "^1.3.0",
+    "@fullhuman/postcss-purgecss": "^2.0.5",
     "browser-sync": "^2.26.7",
     "color-shorthand-hex-to-six-digit": "^2.10.53",
     "css-mqpacker": "^7.0.0",