Hi,

As a member of the Debian Ruby team, I am preparing an update of the htree package for Debian.

Could you please make the license of this work more explicit? The README mentions that the license is that of Ruby, which meant at the time the project was first released,
ruby's specific conditions listed here:
https://www.ruby-lang.org/en/about/license.txt
or GPL-2. In the meantime, Ruby's alternative license changed from GPL-2 to BSD-2-clause. Does the same apply for your project?
Please include a LICENSE file with the Ruby's license mentioning if it is (Ruby's clauses or GPL-2) or (Ruby's clauses or BSD-2-clause) and in the former case, include a COPYING file with the copy of the GPL-2 license, as required.

Thanks in advance.