v prefix throws

[staff0rd]

Prefixing a tag with v has an unexpected result

Repro

mkdir semver-test
cd semver-test
touch file
git init
git add .
git commit -m 'first'
git tag v1.0.0
npx git2semver
npx: installed 3 in 2.093s
(node:10961) UnhandledPromiseRejectionWarning: Non-zero exit
(node:10961) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:10961) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.