Bump am.ik.maven:nullability-maven-plugin from 0.2.0 to 0.3.0 (#67)

Bumps [am.ik.maven:nullability-maven-plugin](https://github.com/making/nullability-maven-plugin) from 0.2.0 to 0.3.0.
- [Release notes](https://github.com/making/nullability-maven-plugin/releases)
- [Commits](making/nullability-maven-plugin@0.2.0...0.3.0)

---
updated-dependencies:
- dependency-name: am.ik.maven:nullability-maven-plugin
  dependency-version: 0.3.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

pom.xml

@@ -77,7 +77,7 @@
 			<plugin>
 				<groupId>am.ik.maven</groupId>
 				<artifactId>nullability-maven-plugin</artifactId>
-				<version>0.2.0</version>
+				<version>0.3.0</version>
 				<extensions>true</extensions>
 				<executions>
 					<execution>