Thread-safety

[ginkel]

When running a parallel Maven (3.6.3) build (via mvn -T) that includes the gauge-maven-plugin, the following warning is emitted:

[WARNING] *
[WARNING] * Your build is requesting parallel execution, but project      *
[WARNING] * contains the following plugin(s) that have goals not marked   *
[WARNING] * as @threadSafe to support parallel building.                  *
[WARNING] * While this /may/ work fine, please look for plugin updates    *
[WARNING] * and/or request plugins be made thread-safe.                   *
[WARNING] * If reporting an issue, report it against the plugin in        *
[WARNING] * question, not against maven-core                              *
[WARNING] *
[WARNING] The following plugins are not marked @threadSafe in <redacted>:
[WARNING] com.thoughtworks.gauge.maven:gauge-maven-plugin:1.4.3
[WARNING] Enable debug to see more precisely which goals are not marked @threadSafe.
[WARNING] *