custom bindings - dependency problem

Execution gen of goal com.github.davidmoten:jax-maven-plugin:0.1.8:xjc failed.: NullPointerException .
it seems that does not find this dependency

```

org.jvnet.jaxb2_commons
jaxb2-namespace-prefix
1.3

```

Full example
```

com.github.davidmoten
jax-maven-plugin
0.1.8


org.jvnet.jaxb2_commons
jaxb2-basics
1.11.1


org.jvnet.jaxb2_commons
jaxb2-namespace-prefix
1.3





gen
generate-sources

xjc



true



-verbose

-d
${project.build.sourceDirectory}

src/main/resources/schema

-b
src/main/resources/xjb/jaxb-bindings.xjb

-extension
-Xnamespace-prefix
-Xinject-code








```