Add option to auto recenter after diff-hl-{next,previous}-hunk#260

NicholasBHubbard wants to merge 2 commits intodgutov:masterdgutov/diff-hl:masterfrom

NicholasBHubbard:next-prev-hunk-auto-recenterNicholasBHubbard/diff-hl:next-prev-hunk-auto-recenterCopy head branch name to clipboard