Bump purecss from 0.6.2 to 2.2.0

Bumps [purecss](https://github.com/pure-css/pure) from 0.6.2 to 2.2.0.
- [Release notes](https://github.com/pure-css/pure/releases)
- [Changelog](https://github.com/pure-css/pure/blob/master/HISTORY.md)
- [Commits](pure-css/pure@v0.6.2...v2.2.0)

---
updated-dependencies:
- dependency-name: purecss
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -31,7 +31,7 @@
     "keen-ui": "^1.3.0",
     "lodash": "^4.17.15",
     "popper.js": "^1.14.6",
-    "purecss": "^0.6.2",
+    "purecss": "^2.2.0",
     "tippy.js": "^4.2.1",
     "vue-intl": "^3.1.0"
   },

yarn.lock

@@ -12211,6 +12211,11 @@ purecss@^0.6.2:
   resolved "https://registry.yarnpkg.com/purecss/-/purecss-0.6.2.tgz#f0827d227e909543c5138f36d56c8c613f476b8c"
   integrity sha1-8IJ9In6QlUPFE4821WyMYT9Ha4w=
 
+purecss@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/purecss/-/purecss-2.2.0.tgz#71249802e1babd562b236cf5d0b75b16f158a421"
+  integrity sha512-jEPrAALLgE+InDARWdPDt0AkZ1Bi0yXxHj4BOwWImq06sGIDe5CagPyS6Z9WGyEgMuZonrrhinInJ80nAHTIUA==
+
 q@^1.1.2:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.1.tgz#7e32f75b41381291d04611f1bf14109ac00651d7"