Update README to reflect rebase undo/redo functionality.
Update README to reflect rebase undo/redo functionality.

jmanuel1/GitSavvy,dvcrn/GitSavvy,jmanuel1/GitSavvy,divmain/GitSavvy,asfaltboy/GitSavvy,ddevlin/GitSavvy,ralic/GitSavvy,stoivo/GitSavvy,dreki/GitSavvy,divmain/GitSavvy,divmain/GitSavvy,dvcrn/GitSavvy,asfaltboy/GitSavvy,stoivo/GitSavvy,ddevlin/GitSavvy,ralic/GitSavvy,theiviaxx/GitSavvy,ddevlin/GitSavvy,stoivo/GitSavvy,theiviaxx/GitSavvy,dreki/GitSavvy,asfaltboy/GitSavvy