TST: properly skip html5lib
Merge pull request #4276 from cpcloud/html5lib-skip-fix

TST: properly skip html5lib
TST/CI: remove html5lib from 3.2 build
Merge pull request #4278 from cpcloud/remove-html5lib-from-3.2-build

TST/CI: remove html5lib from 3.2 build
DOC: cookbook example