Switch from css.escape to cssesc

This is what postcss-selector-parser uses internally, best to rely on the same escaping logic everywhere.

package.json

@@ -44,7 +44,7 @@
     "autoprefixer": "^9.4.5",
     "bytes": "^3.0.0",
     "chalk": "^2.4.1",
-    "css.escape": "^1.5.1",
+    "cssesc": "^3.0.0",
     "fs-extra": "^4.0.2",
     "lodash": "^4.17.11",
     "node-emoji": "^1.8.1",

src/util/escapeClassName.js

@@ -1,5 +1,5 @@
-import escape from 'css.escape'
+import cssesc from 'cssesc'
 
 export default function escapeClassName(className) {
-  return escape(className)
+  return cssesc(className, { isIdentifier: true })
 }

yarn.lock

@@ -1481,11 +1481,6 @@ cross-spawn@^5.0.1, cross-spawn@^5.1.0:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-css.escape@^1.5.1:
-  version "1.5.1"
-  resolved "https://registry.yarnpkg.com/css.escape/-/css.escape-1.5.1.tgz#42e27d4fa04ae32f931a4b4d4191fa9cddee97cb"
-  integrity sha1-QuJ9T6BK4y+TGktNQZH6nN3ul8s=
-
 cssesc@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-2.0.0.tgz#3b13bd1bb1cb36e1bcb5a4dcd27f54c5dcb35703"