Support GPG signing of git tags

[alethea]

This PR allows Lerna to work with a user's git config to allow signing of tags.

Description

I removed the -a option from the invocation of git tag. Since we're invoking git tag with -m, this will have no effect on the generated tag unless a user has the tag.forceSignAnnotated option enabled in their git config.

Motivation and Context

This is the easy solution to #814

How Has This Been Tested?

All existing tests pass, both with and without tag.forceSignAnnotated enabled in my git config.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[evocateur]

Thanks @alethea!

[lock]

This thread has been automatically locked because there has not been any recent activity after it was closed. Please open a new issue for related bugs.