Adds syntax highlighting to README.md

README.md

@@ -20,7 +20,9 @@ This project only includes _minimal_ frameworks, in other words, boilerplate / c
 
 To use the CSS switcher, just add the following line anywhere within the body tag on your page:
 
-        <script src="https://dohliam.github.io/dropin-minimal-css/switcher.js" type="text/javascript"></script>
+```html
+<script src="https://dohliam.github.io/dropin-minimal-css/switcher.js" type="text/javascript"></script>
+```
 
 That's it! You should now be able to cycle through the different frameworks by choosing them from the dropdown at the top of the page.