Update the install instructions to reflect the changes for an integrated git-subtree. Signed-off-by: David A. Greene <greened@obbligato.org>
git-subtree-dir: contrib/subtree git-subtree-mainline: e8dde3e5f9ddb7cf95a6ff3cea6cf07c3a2db80d git-subtree-split: d3a04e06c77d57978bb5230361c64946232cc346