Add update to readme

Bryce Hill · Bryce Hill · commit 9058f748a3d1 · 2019-04-02T11:22:49.000-07:00
diff --git a/README.md b/README.md
@@ -31,6 +31,19 @@ yarn && yarn dev && yarn prod
 }
 
 ```
+### UPDATE
+This was fixed in v4.12.1 as described [here](https://github.com/webpack/webpack/issues/7094#issuecomment-399740371). However, 
+the issue broke again in the next minor release (v4.13.0). I pushed a branch 
+([webpack-v4.13.0-bad](https://github.com/brycehill/webpack-css-order/tree/webpack-v4.13.0-bad)) to demonstrate that:
+
+```
+git checkout webpack-v4.13.0-bad
+yarn && yarn dev && yarn prod
+```
+
+And you will see that the css order differs between the dev and prod builds.
+
+--- 
 
 I can mitigate this by: 
 
