add reference, Wikipedia UML Sequence diagram

projects/Assignments/README.md

@@ -25,4 +25,4 @@ You can now verify that your files are been shared by checking the website:
 
 * [Netbeans 8](http://www.netbeans.org) and [Using Git Support](https://netbeans.org/kb/docs/ide/git.html) with [tutorial video](https://netbeans.org/kb/docs/ide/github_nb_screencast.html)
 * [GitLab Flavored Markdown (GFM)](https://docs.gitlab.com/ee/user/markdown.html) and [Markdown Cheatsheet](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)
-* Wikipedia: UML [Sequence diagram](https://en.wikipedia.org/wiki/Sequence_diagram)
+* UML [Sequence diagram](https://en.wikipedia.org/wiki/Sequence_diagram) on Wikipedia