docs(github): add 'css-loader' request

Author: matteocng

.github/ISSUE_TEMPLATE

@@ -14,7 +14,8 @@ Please [search all issues](https://github.com/matteocng/react-flag-icon-css/issu
   - [ ] I am using `yarn` version: .........
   - [ ] I am using `npm` version: .........
 - [ ] I am using standard Css.
-- [ ] I am using React Css Modules version: .........
+- [ ] I am using Css Modules.
+  - ```js Copy-paste the 'css-loader' configuration object in your webpack config here. ```
 - [ ] This issue is related to type checking.
   - [ ] I am using Facebook's Flow version: .........
 - [ ] This issue is related to custom flags.