[semver:patch] Push to main instead of master

[levent]

No description provided.

[gmemstr]

@levent I think a better approach would be to create a new parameter that defaults to one or the other - I don't see this as a priority though, since master branch will continue to work. That said, there doesn't seem to be any difference between the two, so this is a relatively low impact change.

[gmemstr]

Continuing this discussion internally, but my current line of thinking is that this would be future proofing to some degree - I don't see heroku dropping master anytime soon, but longer term it's a possibility.