Bump @fullhuman/postcss-purgecss from 2.1.2 to 2.2.0

Bumps [@fullhuman/postcss-purgecss](https://github.com/FullHuman/purgecss) from 2.1.2 to 2.2.0.
- [Release notes](https://github.com/FullHuman/purgecss/releases)
- [Changelog](https://github.com/FullHuman/purgecss/blob/master/CHANGELOG.md)
- [Commits](FullHuman/purgecss@v2.1.2...v2.2.0)

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

Author: dependabot-preview[bot]

yarn.lock

@@ -846,12 +846,12 @@
     minimist "^1.2.0"
 
 "@fullhuman/postcss-purgecss@^2.1.2":
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/@fullhuman/postcss-purgecss/-/postcss-purgecss-2.1.2.tgz#8fe4d4ae2b58214b5452cb490a31c7146517442f"
-  integrity sha512-Jf34YVBK9GtXTblpu0svNUJdA7rTQoRMz+yEJe6mwTnXDIGipWLzaX/VgU/x6IPC6WvU5SY/XlawwqhxoyFPTg==
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/@fullhuman/postcss-purgecss/-/postcss-purgecss-2.2.0.tgz#2b3699287163ff515f25ccdae5b96a244eebb41a"
+  integrity sha512-q4zYAn8L9olA5uneaLhxkHRBoug9dnAqytbdX9R5dbzSORobhYr1yGR2JN3Q1UMd5RB0apm1NvJekHaymal/BQ==
   dependencies:
-    postcss "7.0.27"
-    purgecss "^2.1.2"
+    postcss "7.0.28"
+    purgecss "^2.2.0"
 
 "@istanbuljs/load-nyc-config@^1.0.0":
   version "1.0.0"
@@ -4433,10 +4433,10 @@ postcss-value-parser@^4.0.3:
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.0.3.tgz#651ff4593aa9eda8d5d0d66593a2417aeaeb325d"
   integrity sha512-N7h4pG+Nnu5BEIzyeaaIYWs0LI5XC40OrRh5L60z0QjFsqGWcHcbkBvpe1WYpcIS9yQ8sOi/vIPt1ejQCrMVrg==
 
-postcss@7.0.27:
-  version "7.0.27"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.27.tgz#cc67cdc6b0daa375105b7c424a85567345fc54d9"
-  integrity sha512-WuQETPMcW9Uf1/22HWUWP9lgsIC+KEHg2kozMflKjbeUtw9ujvFX6QmIfozaErDkmLWS9WEnEdEe6Uo9/BNTdQ==
+postcss@7.0.28:
+  version "7.0.28"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.28.tgz#d349ced7743475717ba91f6810efb58c51fb5dbb"
+  integrity sha512-YU6nVhyWIsVtlNlnAj1fHTsUKW5qxm3KEgzq2Jj6KTEFOTK8QWR12eIDvrlWhiSTK8WIBFTBhOJV4DY6dUuEbw==
   dependencies:
     chalk "^2.4.2"
     source-map "^0.6.1"
@@ -4538,14 +4538,14 @@ punycode@^2.1.0, punycode@^2.1.1:
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
   integrity sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==
 
-purgecss@^2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/purgecss/-/purgecss-2.1.2.tgz#96f666d04c56705208aaa1a544b5f22e13828955"
-  integrity sha512-5oDBxiT9VonwKmEMohPFRFZrj8fdSVKxHPwq7G5Rx/2pXicZFJu+D4m5bb3NuV0sSK3ooNxq5jFIwwHzifP5FA==
+purgecss@^2.2.0:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/purgecss/-/purgecss-2.2.1.tgz#aa3bdf23370f7539df6154f5e25df2da311cd018"
+  integrity sha512-wngRSLW1dpNr8kr3TL9nTJMyTFI5BiRiaUUEys5M1CA4zEHLF25fRHoshEeDqmhstaNTOddmpYM34zRrUtEGbQ==
   dependencies:
     commander "^5.0.0"
     glob "^7.0.0"
-    postcss "7.0.27"
+    postcss "7.0.28"
     postcss-selector-parser "^6.0.2"
 
 qs@~6.5.2: