Fix microsoft#2

wbhob · web-flow · commit 8e054ac66700 · 2017-08-06T20:38:33.000-04:00
diff --git a/README.md b/README.md
@@ -224,4 +224,4 @@ npm install
 node ./node_modules/webpack/bin/webpack.js
 ```
 
-Run the app by openning `index.html`.
+Run the app by opening `index.html`.
