Update README.md (#1813)

Author: iheng

packages/react-scripts/template/README.md

@@ -139,7 +139,7 @@ For the project to build, **these files must exist with exact filenames**:
 You can delete or rename the other files.
 
 You may create subdirectories inside `src`. For faster rebuilds, only files inside `src` are processed by Webpack.<br>
-You need to **put any JS and CSS files inside `src`**, or Webpack won’t see them.
+You need to **put any JS and CSS files inside `src`**, otherwise Webpack won’t see them.
 
 Only files inside `public` can be used from `public/index.html`.<br>
 Read instructions below for using assets from JavaScript and HTML.