Address the Task "setGitRev" not found error

Documenting the fix for the `Task "setGitRev" not found" error as discussed on this thread https://groups.google.com/d/msg/appium-discuss/sVpuR8uaEXQ/LJUW4HII9OQJ
Merge pull request #3013 from knorrium/patch-1

Address the Task "setGitRev" not found error