Extend Error Messages

[steveoc64]

• Extend ErrTagUnsupported to include the bad tag

[codecov]

Codecov Report

Merging #80 into master will decrease coverage by 0.31%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
- Coverage   94.92%   94.61%   -0.32%     
==========================================
  Files          10       10              
  Lines         965      965              
==========================================
- Hits          916      913       -3     
- Misses         27       29       +2     
- Partials       22       23       +1

Impacted Files	Coverage Δ
faker.go	89.64% <33.33%> (-0.71%)	⬇️

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[bxcodec]

LGTM!

Thanks for the PR!