Update CHANGES.txt for 3.8
Update CHANGES.txt for 3.8

WorksApplications/cassandra,jeromatron/cassandra,cooldoger/cassandra,WorksApplications/cassandra,adejanovski/cassandra,jasonwee/cassandra,ollie314/cassandra,ifesdjeen/cassandra,ptnapoleon/cassandra,josh-mckenzie/cassandra,clohfink/cassandra,krummas/cassandra,jbellis/cassandra,stef1927/cassandra,bmel/cassandra,strapdata/cassandra,modempachev4/kassandra,thelastpickle/cassandra,blerer/cassandra,jrwest/cassandra,szhou1234/cassandra,jeffjirsa/cassandra,WorksApplications/cassandra,Jollyplum/cassandra,jeffjirsa/cassandra,mike-tr-adamson/cassandra,bcoverston/cassandra,thobbs/cassandra,jeffjirsa/cassandra,aboudreault/cassandra,iamaleksey/cassandra,weideng1/cassandra,aboudreault/cassandra,jeromatron/cassandra,krummas/cassandra,yukim/cassandra,weideng1/cassandra,josh-mckenzie/cassandra,carlyeks/cassandra,thelastpickle/cassandra,jasonstack/cassandra,cooldoger/cassandra,jrwest/cassandra,aureagle/cassandra,DikangGu/cassandra,snazy/cassandra,belliottsmith/cassandra,Jaumo/cassandra,bdeggleston/cassandra,pauloricardomg/cassandra,sedulam/CASSANDRA-12201,spodkowinski/cassandra,ifesdjeen/cassandra,michaelsembwever/cassandra,yukim/cassandra,vaibhi9/cassandra,DikangGu/cassandra,bmel/cassandra,driftx/cassandra,carlyeks/cassandra,iamaleksey/cassandra,apache/cassandra,jasonwee/cassandra,mambocab/cassandra,apache/cassandra,aboudreault/cassandra,szhou1234/cassandra,snazy/cassandra,jrwest/cassandra,WorksApplications/cassandra,vaibhi9/cassandra,jasonstack/cassandra,jasonstack/cassandra,michaelsembwever/cassandra,scylladb/scylla-tools-java,mambocab/cassandra,aureagle/cassandra,belliottsmith/cassandra,ifesdjeen/cassandra,joesiewert/cassandra,yhnishi/cassandra,instaclustr/cassandra,hengxin/cassandra,yhnishi/cassandra,sedulam/CASSANDRA-12201,mike-tr-adamson/cassandra,belliottsmith/cassandra,michaelsembwever/cassandra,blambov/cassandra,szhou1234/cassandra,mkjellman/cassandra,clohfink/cassandra,blambov/cassandra,spodkowinski/cassandra,beobal/cassandra,instaclustr/cassandra,ollie314/cassandra,jbellis/cassandra,jeffjirsa/cassandra,aweisberg/cassandra,jbellis/cassandra,beobal/cassandra,szhou1234/cassandra,blambov/cassandra,Instagram/cassandra,juiceblender/cassandra,clohfink/cassandra,sedulam/CASSANDRA-12201,apache/cassandra,joesiewert/cassandra,sharvanath/cassandra,jasobrown/cassandra,bdeggleston/cassandra,apache/cassandra,yukim/cassandra,josh-mckenzie/cassandra,hengxin/cassandra,adelapena/cassandra,scaledata/cassandra,juiceblender/cassandra,tjake/cassandra,cooldoger/cassandra,bcoverston/cassandra,beobal/cassandra,mike-tr-adamson/cassandra,strapdata/cassandra,hhorii/cassandra,sharvanath/cassandra,adejanovski/cassandra,tjake/cassandra,Jollyplum/cassandra,thelastpickle/cassandra,adelapena/cassandra,pauloricardomg/cassandra,mshuler/cassandra,modempachev4/kassandra,michaelsembwever/cassandra,adejanovski/cassandra,christian-esken/cassandra,spodkowinski/cassandra,driftx/cassandra,aweisberg/cassandra,tommystendahl/cassandra,christian-esken/cassandra,belliottsmith/cassandra,chbatey/cassandra-1,adelapena/cassandra,stef1927/cassandra,instaclustr/cassandra,ollie314/cassandra,stef1927/cassandra,driftx/cassandra,chbatey/cassandra-1,scaledata/cassandra,scaledata/cassandra,instaclustr/cassandra,tjake/cassandra,jasonwee/cassandra,mshuler/cassandra,Instagram/cassandra,stef1927/cassandra,hhorii/cassandra,jasobrown/cassandra,yhnishi/cassandra,exoscale/cassandra,krummas/cassandra,spodkowinski/cassandra,aweisberg/cassandra,blerer/cassandra,scylladb/scylla-tools-java,chbatey/cassandra-1,kgreav/cassandra,ifesdjeen/cassandra,iamaleksey/cassandra,thobbs/cassandra,scylladb/scylla-tools-java,strapdata/cassandra,ptnapoleon/cassandra,hhorii/cassandra,jrwest/cassandra,snazy/cassandra,clohfink/cassandra,tommystendahl/cassandra,adelapena/cassandra,mkjellman/cassandra,bdeggleston/cassandra,blerer/cassandra,sharvanath/cassandra,pauloricardomg/cassandra,jasobrown/cassandra,exoscale/cassandra,Instagram/cassandra,mkjellman/cassandra,yukim/cassandra,bcoverston/cassandra,snazy/cassandra,Jollyplum/cassandra,thelastpickle/cassandra,christian-esken/cassandra,hengxin/cassandra,beobal/cassandra,DikangGu/cassandra,blerer/cassandra,vaibhi9/cassandra,tjake/cassandra,mshuler/cassandra,Jaumo/cassandra,exoscale/cassandra,ptnapoleon/cassandra,bmel/cassandra,mambocab/cassandra,mshuler/cassandra,weideng1/cassandra,aureagle/cassandra,josh-mckenzie/cassandra,modempachev4/kassandra,krummas/cassandra,juiceblender/cassandra,blambov/cassandra,juiceblender/cassandra,kgreav/cassandra,joesiewert/cassandra,driftx/cassandra,carlyeks/cassandra,iamaleksey/cassandra,tommystendahl/cassandra,aweisberg/cassandra,tommystendahl/cassandra,thobbs/cassandra,Instagram/cassandra,strapdata/cassandra,pauloricardomg/cassandra,kgreav/cassandra,bdeggleston/cassandra,bcoverston/cassandra,kgreav/cassandra,jeromatron/cassandra,mkjellman/cassandra,scylladb/scylla-tools-java,mike-tr-adamson/cassandra,jasobrown/cassandra,Jaumo/cassandra,cooldoger/cassandra