`release.sh` fails if tag already exists

When running ./release.sh with an tag that already exists, the script fails.

$ ./release.sh 1.14.0
Changing directory to root of repository
Changing to branch 'release/1.14'
Already on 'release/1.14'
Your branch is up to date with 'origin/release/1.14'.
Creating new tag 'v1.14.0'
fatal: tag 'v1.14.0' already exists

Edited Mar 20, 2018 by Ghost User

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