Vim: ignore untracked files in Lawrencium submodule
Vim: ignore untracked files in Lawrencium submodule

Keep the noise out of `git status` caused by the untracked file
"doc/tags".

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent