CompatHelper: bump compat for "Documenter" to "0.27" for package docs

[github-actions[bot]]

This pull request changes the compat entry for the Documenter package from 0.26 to 0.26, 0.27 for package docs.

This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[coveralls]

Pull Request Test Coverage Report for Build 926923169

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.672%

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Totals
Change from base Build 914889610:	0.0%
Covered Lines:	462
Relevant Lines:	488

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💛 - Coveralls

[codecov-commenter]

Codecov Report

Merging #102 (658f4d7) into master (3674ceb) will increase coverage by 0.10%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
+ Coverage   94.57%   94.67%   +0.10%     
==========================================
  Files           7        7              
  Lines         479      488       +9     
==========================================
+ Hits          453      462       +9     
  Misses         26       26              

Impacted Files	Coverage Δ
src/utils.jl	100.00% <100.00%> (ø)

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