Add method to include accounts resolve param

[paultyng]

Unsure what is the preferred way to add params that aren't currently exposed. Would you prefer a variadic parameter with modifiers or something, or just add additional methods like this? There is another param missing but I didn't need it for my usecase: following: https://docs.joinmastodon.org/methods/accounts/

[mattn]

Could you please add test?

[codecov-commenter]

Codecov Report

Base: 87.16% // Head: 87.28% // Increases project coverage by +0.12% 🎉

Coverage data is based on head (f610598) compared to base (7dfe81e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
+ Coverage   87.16%   87.28%   +0.12%     
==========================================
  Files          15       15              
  Lines         935      944       +9     
==========================================
+ Hits          815      824       +9     
  Misses         75       75              
  Partials       45       45              

Impacted Files	Coverage Δ
accounts.go	100.00% <100.00%> (ø)

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[mattn]

Sorry, test already exists.

[mattn]

Could you please fix conflicts?