Log Message:
dnscrypt-proxy2: update to version 2.0.18

* Version 2.0.18
 - Official builds now support TLS 1.3.
 - The timeout for the initial connectivity check can now be set from
the command line.
 - An `Accept:` header is now always sent with `GET` queries.
 - BOMs are now ignored in configuration files.
 - In addition to SOCKS, HTTP and HTTPS proxies are now supported for
DoH servers.