Bump com.github.davidmoten:state-machine-generator from 0.2.19 to 0.3.0

Bumps [com.github.davidmoten:state-machine-generator](https://github.com/davidmoten/state-machine) from 0.2.19 to 0.3.0.
- [Release notes](https://github.com/davidmoten/state-machine/releases)
- [Commits](davidmoten/state-machine@0.2.19...0.3.0)

---
updated-dependencies:
- dependency-name: com.github.davidmoten:state-machine-generator
  dependency-version: 0.3.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

rxjava2-pool/pom.xml

@@ -59,7 +59,7 @@
         <dependency>
             <groupId>com.github.davidmoten</groupId>
             <artifactId>state-machine-generator</artifactId>
-            <version>0.2.19</version>
+            <version>0.3.0</version>
             <scope>test</scope>
         </dependency>
     </dependencies>