Remove Battle for Azeroth section from README
Remove Battle for Azeroth section from README

Now that BFA has been launched, https://bfa.wowanalyzer.com has been
taken down and the main branch is once again master

ronaldpereira/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,anom0ly/WoWAnalyzer,yajinni/WoWAnalyzer,anom0ly/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,anom0ly/WoWAnalyzer,sMteX/WoWAnalyzer,Juko8/WoWAnalyzer,ronaldpereira/WoWAnalyzer,fyruna/WoWAnalyzer,ronaldpereira/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,yajinni/WoWAnalyzer,yajinni/WoWAnalyzer,yajinni/WoWAnalyzer,FaideWW/WoWAnalyzer,FaideWW/WoWAnalyzer,Juko8/WoWAnalyzer,fyruna/WoWAnalyzer,sMteX/WoWAnalyzer,fyruna/WoWAnalyzer,Juko8/WoWAnalyzer,sMteX/WoWAnalyzer,FaideWW/WoWAnalyzer,anom0ly/WoWAnalyzer