Log Message:
dnscrypt-proxy2: update to to 2.0.17.

Changes:

* Go >= 1.11 is now supported
* When dropping privileges, there is no supervisor process any more.
* DNS options used to be cleared from DNS queries, with the exception of flags \ 
and payload sizes. This is not the case any more.
* DoH queries are smaller, since workarounds are not required any more after \ 
Google updated their implementation.