Update README.md

README.md

@@ -20,7 +20,7 @@ Some of the helping files are:
 
 The main files are:
 * `index.html` - Obvious.
-* `about.html` - Also prety obvious. Images are placed in about folder.
+* `about.html` - Also pretty obvious. Images are placed in about folder.
 * `example1.html` - Rather elaborate example, you probably don't want to use this.
 * `example2.html` - Simpler, prefered.
 * `example3.html` - More images.