chainparams: Remove seed.bitcoinstats.com

This seeder no longer appears to be serving sufficient addresses.

Author: achow101

src/kernel/chainparams.cpp

@@ -145,7 +145,6 @@ class CMainParams : public CChainParams {
         vSeeds.emplace_back("seed.bitcoin.sipa.be."); // Pieter Wuille, only supports x1, x5, x9, and xd
         vSeeds.emplace_back("dnsseed.bluematt.me."); // Matt Corallo, only supports x9
         vSeeds.emplace_back("dnsseed.bitcoin.dashjr-list-of-p2p-nodes.us."); // Luke Dashjr
-        vSeeds.emplace_back("seed.bitcoinstats.com."); // Christian Decker, supports x1 - xf
         vSeeds.emplace_back("seed.bitcoin.jonasschnelli.ch."); // Jonas Schnelli, only supports x1, x5, x9, and xd
         vSeeds.emplace_back("seed.btc.petertodd.net."); // Peter Todd, only supports x1, x5, x9, and xd
         vSeeds.emplace_back("seed.bitcoin.sprovoost.nl."); // Sjors Provoost