Allow using gitmojis in the commit message description.

Looks like they are detected as part of the scope.

For example, the following commit message generated in VSCode using Conventional Commits extension:

chore: :hammer: Add commitlint as git commit-msg hook

Also add **Conventional Commits** VSCode extension

gives:

commitlint

→ input: "chore: :hammer: Add co..."

Errors:
  ❌ parser: scope must be followed by ': '

Total 1 errors, 0 warnings, 0 other severities