Taking over maintainership of bitvec

[Andrew Lelechenko]

I would like to take over `bitvec` package
(https://hackage.haskell.org/package/bitvec).

Unfortunately, the source code has not been updated for years and the
test suite does not build nowadays. There are also known issues. I
have prepared patches and tried to reach its maintainer James Cook
(cced) by email, but have not heard back.

There was a takeover of another James' package in October 2018
(https://mail.haskell.org/pipermail/libraries/2018-October/029062.html).
In that case James appeared to be out of reach.

--
Best regards,
Andrew