Disable connection verification by default

This matches the vanilla, Spigot, BungeeCord and Velocity configuration.
Mojang seems to have too many issues like IPv6 errors and it's atm not
very useful for server administrators.

Fixes #1102

Author: games647

core/src/main/resources/config.yml

@@ -171,7 +171,7 @@ premium-warning: true
 # This option is considered highly experimental. While it is highly unlikely this will break your server,
 # more tests need to be conducted in order to verify its effectiveness. Brief tests seemed promising, but
 # every environment is different, and so it might not work for you as it did for me.
-useProxyAgnosticResolver: false
+useProxyAgnosticResolver: true
 
 # If you have autoRegister or nameChangeCheck enabled, you could be rate-limited by Mojang.
 # The requests of the both options will be only made by FastLogin if the username is unknown to the server