Upgrade devDependency hallmark from ^2.0.0 to ^3.0.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
hallmark	devDependencies	major	^2.0.0 -> ^3.0.0

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Release Notes

vweevers/hallmark

v3.0.0

Compare Source

Changed

• Breaking: drop node < 10 and upgrade dependencies (02e7c00). Now silently exits on node < 10. Two dozen remark modules have been upgraded, many with breaking changes though most don't apply here. One thing I've noticed is that text like module@1.0.0 will be converted to a mailto link. Wrap such text in backticks.
• Breaking: remove depth limit on table of contents (031a6ae)
• Bump remark-changelog (4868875). Adds experimental git submodule support.

Added

• Support passing options to remark-changelog (6a3923e).

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