FileLoggerTree doesn't print anything lower than ERROR

[cepages]

Firstly thanks for your code, It's great!

Secondly I found that the logger doesn't print in the file anything lower than ERROR.

I fixed this setting the level in the logger.

        logger.setLevel(fromPriorityToLevel(priority));

I added it in the FileLoggerTree constructor.

Do you think it's a bug, or I'm missing something.

If it's a bug, I'm happy to open a pull request :)

[cepages]

I realised that the fix, it's in the version 0.0.3.

I created a pull request for updating the version in the readme :)

#2