Modlauncher can't detect interfaces of transformer parents

[Su5eD]

Suppose you have a base ITransformer class with a subclass for each type:

public abstract class BaseTransformer<T> implements ITransformer<T>
├─ public class ClassTransformer extends BaseTransformer<ClassNode>
├─ public class MethodTransformer extends BaseTransformer<MethodNode>
└─ public class FieldTransformer extends BaseTransformer<FieldNode>

Modlauncher expects the interface to be implemented in the transformer class itself.
Therefore running this structure will result in an exception.

[cpw]

arguably, this is a trivial fix in the code: implement on the class itself, rather than the parent. It's a bit untidier but would result in functional code.

[Su5eD]

Fixed by #102