No version number properties

[exabrial]

This is in the startup log:

^[[A^[[B2019-02-16T08:54:08.580-06:00 ERROR [Version] Unable to read com.github.exabrial.graylog-plugin-openwire/graylog-plugin.properties, this build has no version number.
com.github.zafarkhaja.semver.UnexpectedCharacterException: null
	at com.github.zafarkhaja.semver.VersionParser.consumeNextCharacter(VersionParser.java:516) ~[graylog.jar:?]
	at com.github.zafarkhaja.semver.VersionParser.digits(VersionParser.java:448) ~[graylog.jar:?]
	at com.github.zafarkhaja.semver.VersionParser.numericIdentifier(VersionParser.java:408) ~[graylog.jar:?]
	at com.github.zafarkhaja.semver.VersionParser.parseVersionCore(VersionParser.java:285) ~[graylog.jar:?]
	at com.github.zafarkhaja.semver.VersionParser.parseValidSemVer(VersionParser.java:255) ~[graylog.jar:?]
	at com.github.zafarkhaja.semver.VersionParser.parseValidSemVer(VersionParser.java:195) ~[graylog.jar:?]
	at com.github.zafarkhaja.semver.Version.valueOf(Version.java:265) ~[graylog.jar:?]
	at org.graylog2.plugin.Version.fromClasspathProperties(Version.java:219) [graylog.jar:?]
	at org.graylog2.plugin.Version.fromPluginProperties(Version.java:163) [graylog.jar:?]
	at com.github.exabrial.graylog.OpenwireInputMetadata.getRequiredVersion(OpenwireInputMetadata.java:46) [graylog-plugin-openwire-1.0.1.jar:?]
	at org.graylog2.bootstrap.CmdLineTool.loadPlugins(CmdLineTool.java:297) [graylog.jar:?]
	at org.graylog2.bootstrap.CmdLineTool.installPluginConfigAndBindings(CmdLineTool.java:270) [graylog.jar:?]
	at org.graylog2.bootstrap.CmdLineTool.run(CmdLineTool.java:172) [graylog.jar:?]
	at org.graylog2.bootstrap.Main.main(Main.java:50) [graylog.jar:?]
2019-02-16T08:54:08.588-06:00 INFO  [CmdLineTool] Loaded plugin: ActiveMQ Openwire Input Plugin 1.0.1 [com.github.exabrial.graylog.OpenwireGELFInput]