Change license of ru-litbrl.ctb to LGPL 2.1
Change license of ru-litbrl.ctb to LGPL 2.1

Igor Paretsky agreed to it. See
https://github.com/liblouis/liblouis/pull/937.

hammera/liblouis,liblouis/liblouis,hammera/liblouis,hammera/liblouis,BueVest/liblouis,BueVest/liblouis,hammera/liblouis,liblouis/liblouis,hammera/liblouis,liblouis/liblouis,BueVest/liblouis,BueVest/liblouis,hammera/liblouis,BueVest/liblouis,BueVest/liblouis,liblouis/liblouis,liblouis/liblouis,liblouis/liblouis