Update README.md
Update README.md

Updated Fork Visualization One Liner
Zest version of Fork Visualisation
Merge pull request #11 from cmalai/master

Zest Version of Fork Visualisation
Fixed
Icon for Visualisation View
Error Prompt on selecting a Private Repository
Merge pull request #12 from cmalai/master

Fixed : Error on Selecton of Private Repository
Included github fork visualisation plugin inside features.xml
icons folder was not included in build, has been added.
Enabled Empty Client Object without UserName and Password to access
Public Repositories.
Updated License with EPL
Merge pull request #13 from cmalai/master

Fixed Bug caused due to GitHubClient.
Added File separator instead of slash. As it was crashing on Linux.