GIT: compare branch with its base

# https://stackoverflow.com/questions/20808892/git-diff-between-current-branch-and-master-but-not-including-unmerged-master-com/20809283

# get base of branch
git merge-base master branch
# example output 47dfa4a64fbbf8cc71006b488e18ddc87b801ffe

# get diff between branch and base
git diff 47dfa4a64fbbf8cc71006b488e18ddc87b801ffe branch

# use diff2html (npm: diff2html-cli)
diff2html -- 47dfa4a64fbbf8cc71006b488e18ddc87b801ffe branch