Update dependency "html5 to "html5lib"

[onuralpszr]

Mailmerge dependency html5 has been renamed to html5lib.

Closes #137

[awdeorio]

Thanks for the contribution @thunderbirdtr ! It would be helpful if you could add an an issue that describes the problem. Then, fix the issue with this PR. At the very least, could you add a comment describing the problem?

[onuralpszr]

@awdeorio issue opened and "comment" typed on the issue and this PR also edited and point to issue as well.

[awdeorio]

LGTM

[awdeorio]

I made some updates upstream to fix recent linter errors (#138). Could you try merging in the latest upstream develop? I think that should get the tests passing.

[onuralpszr]

@awdeorio ready to test.

[codecov-commenter]

Codecov Report

Merging #136 (d364e32) into develop (7146f27) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #136   +/-   ##
========================================
  Coverage    99.70%   99.70%           
========================================
  Files            5        5           
  Lines          344      344           
========================================
  Hits           343      343           
  Misses           1        1           

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[awdeorio]

I made a new release so you should be good to go with your downstream packaging @thunderbirdtr https://github.com/awdeorio/mailmerge/releases/tag/2.2.1