add npm i source-map-loader troubleshooting step

ara4n · ara4n · commit a05437e81f22 · 2015-10-10T18:51:22.000+01:00
diff --git a/README.md b/README.md
@@ -34,6 +34,9 @@ changes to the react sdk, you can:
 If you add or remove any components from the Vector skin, you will need to rebuild
 the skin's index by running, `npm run reskindex`.
 
+You may need to run `npm i source-map-loader` in matrix-js-sdk if you get errors
+about "Cannot resolve module 'source-map-loader'" due to shortcomings in webpack.
+
 Deployment
 ==========
 
