Added Fossil to Version Control section

Fossil is a version control system that uses SQLite.

README.md

@@ -278,6 +278,7 @@ Comparison of NoSQL servers: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-v
 ## Version control
 *Software versioning and revision control.*
 
+* [Fossil](http://www.fossil-scm.org/) - Distributed version control with built-in wiki and bug tracking.
 * [Git](http://git-scm.com/) - Distributed revision control and source code management (SCM) with an emphasis on speed.
 * [Mercurial](http://mercurial.selenic.com/) - Another distributed revision control.
 * [Subversion](http://subversion.apache.org/) - Client-server revision control system.