Renaming master to main

[j-bennet]

We renamed master branch of pgcli to main.

If you have a local clone of pgcli where main branch is still master, you'll have to do the following:

git branch -m master main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a

cc @dbcli/pgcli-core.

[laixintao]

LGTM

[dbaty]

Renaming happened 2 years ago, I am closing this (I guess it was an announcement more than a discussion).

[laixintao]

Yes, we are on main now.