Add support to vote on polls. Add more fields to Poll

[RasmusLindroth]

Hi,

I've added two more functions to the API.

• GetPoll to fetch polls by their ID.
• PollVote to vote on a poll with the ID and the index of the polls choices

[mattn]

Thank you. I added GitHub Actions for CI. Could you please rebase master?

[codecov-commenter]

Codecov Report

Merging #140 (c0a2091) into master (8c434b5) will increase coverage by 0.38%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
+ Coverage   77.66%   78.05%   +0.38%     
==========================================
  Files          29       30       +1     
  Lines        1330     1358      +28     
==========================================
+ Hits         1033     1060      +27     
+ Misses        205      204       -1     
- Partials       92       94       +2     

Impacted Files	Coverage Δ
polls.go	83.33% <83.33%> (ø)
status.go	72.72% <86.66%> (+1.21%)	:arrow_up:
streaming.go	97.40% <100.00%> (+0.03%)	:arrow_up:
cmd/mstdn/main.go	66.80% <0.00%> (+1.20%)	:arrow_up:

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[RasmusLindroth]

I'm no expert at git, but I think I managed to rebase it as you wanted me to :)

[mattn]

Perfect. Thank you!