Fix passing agent to did:web fetch options.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

Merging #21 (25674d0) into main (02ed0bd) will increase coverage by 0.13%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   93.33%   93.46%   +0.13%     
==========================================
  Files           2        2              
  Lines         150      153       +3     
==========================================
+ Hits          140      143       +3     
  Misses         10       10              

Files	Coverage Δ
lib/index.js	89.69% <100.00%> (+0.32%)	⬆️

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