[DISCUSS] Last release on 3.3.x

[Stephen Mallette <sp...@gmail.com>]

After one dozen releases on 3.3.x, I think we can safely leave that release
line behind at this point to focus on future development. 3.3.x has
diverged in a number of places from master and merging is sometimes not fun
going up through the branches depending on what's changed. Dropping
development there would be nice.

So, that will make the upcoming 3.3.11 the final release on that line and
will leave us with 3.4-dev and master branches, with that hope that we can
see the first release on 3.5.0 out in the coming months.

Unless there are objections in the next 72 hours, I'll assume lazy
consensus and proceed in that direction (i.e. changing docs, making
announcements, etc). Thanks!