v0.7.0

Changelog

• 3c1a8ce Merge pull request #10 from kazhuravlev/warn-on-tag-exists
• 8e2aeff check that commit have only one semver tag
• 9f0e7cc add helper function
• 8e220bf add flag to ignore exists tag
• 3bb6bca upd readme
• 0ff3ab2 check that semver tag is already exists
• 55bce22 get current semver tag
• 04524f4 add deps