The plugin gradle-gitflow does not support non-version tags

[jaubuchon]

Given:
A git repository that is having tags that are not related to a version.

$ git tag
0.1.0
1.2.3
simpletag

When:
Resolving the current version

Then:

Caused by: Unexpected character 'LETTER(p)' at position '0', expecting '[DIGIT]'
        at com.github.zafarkhaja.semver.VersionParser.consumeNextCharacter(VersionParser.java:516)
        at com.github.zafarkhaja.semver.VersionParser.digits(VersionParser.java:448)
        at com.github.zafarkhaja.semver.VersionParser.numericIdentifier(VersionParser.java:408)
        at com.github.zafarkhaja.semver.VersionParser.parseVersionCore(VersionParser.java:285)
        at com.github.zafarkhaja.semver.VersionParser.parseValidSemVer(VersionParser.java:255)
        at com.github.zafarkhaja.semver.VersionParser.parseValidSemVer(VersionParser.java:195)
        at com.github.zafarkhaja.semver.Version.valueOf(Version.java:265)
        at com.github.zafarkhaja.semver.Version$valueOf.call(Unknown Source)
        at com.github.amkay.gradle.gitflow.version.NearestVersionLocator$_locate_closure1.doCall(NearestVersionLocator.groovy:101)
        at com.github.amkay.gradle.gitflow.version.NearestVersionLocator.locate(NearestVersionLocator.groovy:100)
        at com.github.amkay.gradle.gitflow.version.NearestVersionLocator$locate.call(Unknown Source)
        at com.github.amkay.gradle.gitflow.strategy.BranchDevelopStrategy.doInfer(BranchDevelopStrategy.groovy:44)
        at com.github.amkay.gradle.gitflow.strategy.AbstractStrategy.infer(AbstractStrategy.groovy:58)
        at com.github.amkay.gradle.gitflow.strategy.Strategy$infer$0.call(Unknown Source)
        at com.github.amkay.gradle.gitflow.version.DelayedVersionWithType.infer(DelayedVersionWithType.groovy:55)

Our need:
We need to be able to appose not-related version tags to commits

Proposed solution:

At line 101 of:
https://github.com/amkay/gradle-gitflow/blob/1dfd896193e9db2d283cc2aba030742203d4780a/src/main/groovy/com/github/amkay/gradle/gitflow/version/NearestVersionLocator.groovy

Handle the exception "ParseException" threw by the method "Version.valueOf" and go to the next tag.