Fill in NEWS.md file with recent updates

[ledell]

We have been forgetting to update the NEWS.md file with our updates. We should try to fill in what's happened in recent versions by looking at merged PRs.

[maelle]

@ledell since when? I think I added my items but could be wrong + could help.

[maelle]

I actually don't think it's a good first issue as it'll involve some repo archeology 😉

[ledell]

@maelle The last version with a NEWS update is 0.1.1, so we are missing updates for a few versions: https://github.com/rladies/meetupr/blob/master/NEWS.md#meetupr-011

0.2.3.999: All your new changes (documented in NEWS.md but not assigned to a version yet)
0.2.3: 0944297 (need to document what was new in this version)
0.2.2: NA -- somehow this version got skipped
0.2.1: new functionality: #48
0.2.0: Switched to OAuth: #54