value modules has incompatible type

[m-asiatici]

When compiling the example as described in README.md, I get the following error:

[error] ModuleBuilderTest.scala:8:7: overriding value modules in class ModuleBuilder of type Seq[chisel.packaging.ModuleDef];
[error]  value modules has incompatible type
[error]   val modules: List[(() => Module, CoreDefinition)] = List(
[error]       ^
[error] one error found

The following declaration of val modules in ModuleBuilderTest.scala fixes the issue:

val modules: List[ModuleDef] = List(
    ModuleDef(null, // test module
      () => TestModule,
      CoreDefinition(
        name    = "TestModule",
        vendor  = "esa.cs.tu-darmstadt.de",
        library = "chisel",
        version = "1.0",
        root("TestModule")
      )
    )