Merge pull request #2796 from pi-hole/tweak/opendns-ipv6

Use the filtered IPv6 OpenDNS servers

automated install/basic-install.sh

@@ -31,7 +31,7 @@ set -e
 # List of supported DNS servers
 DNS_SERVERS=$(cat << EOM
 Google (ECS);8.8.8.8;8.8.4.4;2001:4860:4860:0:0:0:0:8888;2001:4860:4860:0:0:0:0:8844
-OpenDNS (ECS);208.67.222.222;208.67.220.220;2620:0:ccc::2;2620:0:ccd::2
+OpenDNS (ECS);208.67.222.222;208.67.220.220;2620:119:35::35;2620:119:53::53
 Level3;4.2.2.1;4.2.2.2;;
 Comodo;8.26.56.26;8.20.247.20;;
 DNS.WATCH;84.200.69.80;84.200.70.40;2001:1608:10:25:0:0:1c04:b12f;2001:1608:10:25:0:0:9249:d69b