fix: pass loadCSS as array

Author: andreypopp

Diff for: src/index.js

@@ -341,8 +341,8 @@ export function loader(source: string): string {
   } else {
     let loadCSS = query.loadCSS
       ? query.loadCSS
-      : 'style-loader!css-loader';
-    let requestCSS = `!!${loadCSS}!${LOADER}?css!${this.resource}`;
+      : ['style-loader', 'css-loader'];
+    let requestCSS = `!!${loadCSS.join('!')}!${LOADER}?css!${this.resource}`;
     let result = renderToJS(source, {requestCSS});
     return result;
   }