fix 974: add web export for dereferenceDocument

[potterbm-cb]

Fixes #974 by adding dereferenceDocument and OpenRPCDocumentDereferencingError to the web exports to match index.ts.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (de3dca3) to head (271b67a).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #975   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        16           
  Lines          528       528           
  Branches       136       136           
=========================================
  Hits           528       528           

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[potterbm-cb]

Anyone know how to re-trigger the lint check on this? Or can we merge it?