fix: url options

[brickyang]

Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines
• documentation is changed or added

Affected core subsystem(s)

Description of change

[codecov-io]

Codecov Report

Merging #13 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #13   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines          90     90           
=====================================
  Hits           90     90

Impacted Files	Coverage Δ
lib/mongo.js	100% <100%> (ø)	⬆️

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[brickyang]

#12