Merge pull request #2211 from ember-cli/dependabot/npm_and_yarn/css-tree-3.0.1

build(deps): Bump css-tree from 2.3.1 to 3.0.1

Author: NullVoxPopuli

package.json

@@ -58,7 +58,7 @@
   },
   "dependencies": {
     "@ember-data/rfc395-data": "^0.0.4",
-    "css-tree": "^2.3.1",
+    "css-tree": "^3.0.1",
     "ember-eslint-parser": "^0.5.4",
     "ember-rfc176-data": "^0.3.18",
     "eslint-utils": "^3.0.0",