remove dead irc servers (DNS NXDOMAIN)

servers.txt

@@ -4,8 +4,6 @@ irc.2600.net
 irc.Undernet.Org
 irc.accessirc.net
 irc.afterx.net
-irc.asylo.com
-irc.atheme.org
 irc.atrum.org
 irc.atw-inter.net
 irc.au.dal.net
@@ -14,10 +12,7 @@ irc.azzurra.org
 irc.blitzed.org
 irc.bongster.org
 irc.chat4all.org
-irc.chatcafe.net
-irc.chatnet.org
 irc.chatspike.net
-irc.chattingaway.com
 irc.choopa.net
 irc.coldfront.net
 irc.cyanide-x.net
@@ -67,15 +62,12 @@ irc.ircube.org
 irc.ircworld.nl
 irc.irdsi.net
 irc.kampungchat.org
-irc.kickchat.com
 irc.knightirc.net
 irc.krono.net
 irc.landoleet.org
 irc.langochat.net
 irc.lichtsnel.nl
 irc.maddshark.net
-irc.matrix-network.org
-irc.mmoirc.com
 irc.mozilla.org
 irc.mugglenet.com
 irc.netgamers.org
@@ -98,8 +90,6 @@ irc.serenity-irc.net
 irc.servercentral.net
 irc.shadowfire.org
 irc.shadowworld.net
-irc.simosnap.net
-irc.slacked.org
 irc.slashnet.org
 irc.snt.utwente.nl
 irc.solidirc.com
@@ -110,7 +100,6 @@ irc.starchat.net
 irc.starlink-irc.org
 irc.starlink.org
 irc.staynet.org
-irc.stratics.com
 irc.swiftirc.net
 irc.teksavvy.ca
 irc.teranova.net
@@ -120,9 +109,7 @@ irc.us.gamesurge.net
 irc.utonet.org
 irc.webchat.org
 irc.whatnet.org
-irc.wikkedwire.com
 irc.wondernet.nu
-irc.worldnet.net
 irc.xevion.net
 irc.xs4all.nl
 irc.zerofuzion.net