allow number >= 20 for hundred

[nmorel]

Fixes https://github.com/allo-media/text2num/issues/111

[nmorel]

One regression in french with this more "laxist" change, visible in the unit test. I can make an english parser if needed.

[rtxm]

I propose an alternative solution in #113 that doesn't impact other languages and doesn't need a specific parser.

[nmorel]

@rtxm That's great, thanks ! I'm closing this one then.