feat(hooks): add sample hotfix hooks to git flow

[ChrisJStone]

hotfix start

• filter-flow-hotfix-start-version
• pre-flow-hotfix-start
• post-flow-hotfix-start

hotfix publish

• pre-flow-hotfix-publish
• post-flow-hotfix-publish

hotfix finish

• pre-flow-hotfix-finish
• filter-flow-hotfix-finish-tag-message
• post-flow-hotfix-finish

hotfix delete

• pre-flow-hotfix-delete
• post-flow-hotfix-delete