fix(release): fix typo in ff-master option, should use underscore#27

ChrisJStone wants to merge 1 commit intoCJ-Systems:developCJ-Systems/gitflow-cjs:developfrom

hanks:fix/typo-in-ff-master-optionhanks/gitflow-avh:fix/typo-in-ff-master-optionCopy head branch name to clipboard