feat: deflate support

[danielgtaylor]

Adds support for deflate content encoding.

Fixes #205.

[codecov]

Codecov Report

Merging #210 (6bd162a) into main (2242e20) will increase coverage by 0.23%.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   75.66%   75.90%   +0.23%     
==========================================
  Files          26       26              
  Lines        3550     3606      +56     
==========================================
+ Hits         2686     2737      +51     
- Misses        665      666       +1     
- Partials      199      203       +4     

Files Changed	Coverage Δ
cli/cli.go	70.45% <100.00%> (+0.06%)	⬆️
cli/encoding.go	78.94% <100.00%> (+1.16%)	⬆️

... and 2 files with indirect coverage changes

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