Ales Tamchyna

@lcalem Just a note: `string.printable` only contains ASCII printable characters. When dealing with multiple languages, that can be a major limitation (e.g. it will remove all Chinese characters from a...

In the Maja Popovic's implementation, when multiple references are provided, the one which leads to the highest f-score is used, see: https://github.com/m-popovic/chrF/blob/master/chrF%2B%2B.py#L155