Bug: wrong dependency in Processor

[dzuvic]

the runtime scope of the generated maven pom is wrong:

    <dependency>
      <groupId>org.immutables</groupId>
      <artifactId>value</artifactId>
      <version>2.5.5</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.immutables</groupId>
      <artifactId>builder</artifactId>
      <version>2.5.5</version>
      <scope>runtime</scope>
    </dependency>