Merge branch 'pb/range-diff-with-submodule'

"git -c diff.submodule=log range-diff" did not show anything for submodules that changed in the ranges being compared, and "git -c diff.submodule=diff range-diff" did not work correctly. Fix this by including the "--submodule=short" output unconditionally to be compared. * pb/range-diff-with-submodule: range-diff: show submodule changes irrespective of diff.submodule