Describe current maintenance posture

[sbearrows]

Closes #186, closes #151, closes #250, closes tidyverse/readr#1316

[jennybc]

I am expecting to see some sort of a bullet list appear in the new section and #186 will be on it. As it stands, the reason that this PR closes that issue is very implicit (vs. explicit).

[jennybc]

The main / initial comment still needs to gain a bunch of "Closes #(some issue or PR number)". But otherwise, I entrust this to your hands.

[jennybc]

I moved the "closes" statements into the initial comment.

[sbearrows]

@jennybc I'm not able to merge this probably because it was moved to a new org

[jennybc]

Just to be clear: @sbearrows you'd like me to merge this?

[sbearrows]

@jennybc Yes I'm ready to merge it, but also I think we need to change my permissions again since I'm blocked from merging.

[jennybc]

@sbearrows Your permissions look correct. Perhaps this particular PR is weird, since I believe it pre-dated moving vroom from r-lib to tidyverse? I merged this and we'll just have to see if your inability to merge persists and dig further, if necessary.

[sbearrows]

@jennybc Oh that might explain it. Alright, thanks for merging!