sr / git-wiki

without this I got Grit::InvalidGitRepositoryError.

I suggest that improving README as:

- Run with `mkdir ~/wiki && ./run.ru -sthin -p4567` and point your
+ Run with `mkdir ~/wiki && (cd ~/wiki && git init) && ./run.ru -sthin -p4567` and point your

Versions of which I'm using:
git-wiki (4cd6a1f)
grit (1.1.1)