Commits on Sep 6, 2021

1. Docs: LintMessage.line and column are possibly undefined …

   In `lib/linter/linter.js`, the `parse()` function's exception handler
   translates the exception's message to a `LintMessage`. It also passes
   through the exception's `lineNumber` and `column`, but the exception is
   not guaranteed to have those properties. In that case,
   `LintMessage.line` and `column` can be `undefined`.
   
   In eslint/eslint-plugin-markdown#191, the processor would crash when
   attempting to map messages without a line.
   
   Normally widening a type like this would be a breaking change, but since
   this is only updating the docs to reflect reality, I think this can be a
   semver-patch change.

   

   btmills committed Sep 6, 2021
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