Allow iframe handle as arg to toEqualText and toEqualUrl

[mskelton]

Fixes #85

[codecov-commenter]

Codecov Report

Merging #86 (96895c4) into master (ef09ed8) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 96895c4 differs from pull request most recent head 5d0dd82. Consider uploading reports for the commit 5d0dd82 to get more accurate results

@@           Coverage Diff           @@
##           master      #86   +/-   ##
=======================================
  Coverage   91.61%   91.61%           
=======================================
  Files          11       11           
  Lines         155      155           
  Branches       27       26    -1     
=======================================
  Hits          142      142           
  Misses         13       13           

Impacted Files	Coverage Δ
src/matchers/toEqualUrl/index.ts	100.00% <100.00%> (ø)
src/matchers/utils.ts	98.14% <100.00%> (-0.04%)	⬇️

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[mxschmitt]

awesome work