Fix typo that causes install to break

[DDevine]

pip install of supersqlite is broken due to a typo in a requirement name: lsb-db should actually be lsm-db.

This also resolves #5

[JWCook]

For reference, this appears to affect supersqlite 0.0.76-0.0.78, so if you need this in project dependencies, you can use supersqlite<0.0.76.

EDIT: Actually, 0.0.75 and earlier appear to be broken as well due to an unrelated missing module. So the best option may be:

pip install lsm-db
pip install --no-deps supsersqlite

Unfortunately there's no equivalent of --no-deps for Poetry, so I can't currently add this as a dependency to projects that use Poetry for packaging.

[JWCook]

Also, I see this is a mirror of the main repo at https://gitlab.com/Plasticity/supersqlite. @DDevine Maybe try submitting the PR on GitLab?