Fixed reason length for BezahlCode Generator

[MatzeSch]

Fixed my Issue for reason length limited to 27 characters. #602
The Guideline for SEPA Credit Transfer specifies a limit of 140 characters

Closes #602

[codebude]

Hi @MatzeSch ,

since QRCoder will reach its end of life and the repository will be archived on November 1st, 2025, I’d like to clarify how to proceed with this PR.

Would you prefer me to merge it before the archival, or should I close it instead?
Please let me know what you think – I want to handle your contribution in the way that feels most appropriate to you.

Thanks again for your effort and contribution!

[MatzeSch]

Hi @codebude,

I have already fixed this use in my program. So I don't have any problem with closing this here.
If you considering to move the Project to an other Maintainer, I would be very happy, because I don't have to search an implement a new QRCode Generator.
Also I think it would still be a good Idee to implement the change I did for other people.
Even if I forget to rewrite the tests.

[codebude]

Merged. Thanks for your support. Hopefully I'll find a new maintainer. There is a really promising candidate.