copy fix

Author: dmolsen

README.md

@@ -247,7 +247,7 @@ Tags are the most complicated extension to set-up with Pattern Lab. Three steps
 
 Pattern Lab takes care of the registering for you based on the file name.
 
-An example of a simple tag called `setdupe.test.twig` in `source/_twig-components/tests` that mimics the default `set` tag. Please note all of the locations where class names incorporate the filename, `setdupe`.:
+An example of a simple tag called `setdupe.test.twig` in `source/_twig-components/tests` that mimics the default `set` tag. Please note all of the locations where class names incorporate the filename, `setdupe`.
 
 ```php
 <?php