Clarify why we can't do 'git rev-list' with a path.
tree22bbf813b9be567943e9bcc05c0d21481507a641
-rw-r--r-- 3 .gitignore
lrwxrwxrwx 14 git-subtree -> git-subtree.sh
-rwxr-xr-x 8319 git-subtree.sh
-rw-r--r-- 23 shellopts.sh
-rwxr-xr-x 1989 test.sh
-rw-r--r-- 247 todo