[dsc] dsc v2.15.1 released!

[Jerry Lundström]

Hi all,

This release fixes client subnet indexer which overwrote the mask
options during initialization so the conf option `client_v4_mask` and
`client_v6_mask` was never used.

   <https://www.dns-oarc.net/files/dsc/dsc-2.15.1.tar.gz>
   3219b06938d129e24a831f480e9d549b081941bb01832e6ee37af1bfa47494f0

Packages are available at: <https://dev.dns-oarc.net/packages/>

Other changes:
- Update documentation
- Update builtin known TLDs based on PSL
- Update copyright year

d577a97 Copyright
f71edff Known TLDs
dedafdd Client mask
8ef947c Doc

Cheers,
Jerry