Non semver tag reported as semver

[Aetf]

In https://quay.io/repository/jetstack/cert-manager-cainjector, there are many other tags in addition to semver tags.

Example output:

Image                                    Current             Latest             Behind
quay.io/jetstack/cert-manager-cainjector v1.4.0              8.0.0-b0a39a5      7

There's no actual 8.0.0-b0a39a5 tag, but the 8b0a39a5 tag is parsed as semver. I thought #20 should catch this, but somehow it failed in this case.