Update precommit hook's max line length.
Update precommit hook's max line length.

It appears that we are working with a max line length of 100. If that's
case, let's update the pre-commit file to reflect that (instead of 120).

google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian,t1m0thyj/aiyprojects-raspbian,google/aiyprojects-raspbian,t1m0thyj/aiyprojects-raspbian,google/aiyprojects-raspbian