fix(index): filter ident (options.ident) (#315)

Author: michael-ciniawsky

Diff for: lib/index.js

@@ -51,12 +51,16 @@ module.exports = function loader (css, map) {
 
   Promise.resolve().then(() => {
     const length = Object.keys(options)
-      .filter((option) => {
-        // if (option === 'exec') return
-        if (option === 'config') return
-        if (option === 'sourceMap') return
-
-        return option
+      .filter((option) =>  {
+        switch (option) {
+          // case 'exec':
+          case 'ident':
+          case 'config':
+          case 'sourceMap':
+            return
+          default:
+            return option
+        }
       })
       .length