[livy] Bump minimum spark version in readme
[livy] Bump minimum spark version in readme

MobinRanjbar/hue,kawamon/hue,MobinRanjbar/hue,jjmleiro/hue,Peddle/hue,todaychi/hue,xq262144/hue,lumig242/Hue-Integration-with-CDAP,ahmed-mahran/hue,jayceyxc/hue,cloudera/hue,lumig242/Hue-Integration-with-CDAP,todaychi/hue,Peddle/hue,fangxingli/hue,hdinsight/hue,kawamon/hue,ahmed-mahran/hue,vmax-feihu/hue,jjmleiro/hue,yoer/hue,lumig242/Hue-Integration-with-CDAP,kawamon/hue,kawamon/hue,vmax-feihu/hue,xq262144/hue,todaychi/hue,ahmed-mahran/hue,fangxingli/hue,cloudera/hue,xq262144/hue,yoer/hue,hdinsight/hue,MobinRanjbar/hue,Peddle/hue,yoer/hue,MobinRanjbar/hue,ahmed-mahran/hue,vmax-feihu/hue,kawamon/hue,vmax-feihu/hue,cloudera/hue,vmax-feihu/hue,jjmleiro/hue,todaychi/hue,hdinsight/hue,ahmed-mahran/hue,lumig242/Hue-Integration-with-CDAP,Peddle/hue,xq262144/hue,yoer/hue,yoer/hue,fangxingli/hue,xq262144/hue,jayceyxc/hue,xq262144/hue,kawamon/hue,Peddle/hue,hdinsight/hue,todaychi/hue,jayceyxc/hue,cloudera/hue,kawamon/hue,hdinsight/hue,lumig242/Hue-Integration-with-CDAP,MobinRanjbar/hue,cloudera/hue,cloudera/hue,vmax-feihu/hue,todaychi/hue,ahmed-mahran/hue,yoer/hue,jjmleiro/hue,cloudera/hue,yoer/hue,kawamon/hue,kawamon/hue,jayceyxc/hue,cloudera/hue,todaychi/hue,jayceyxc/hue,Peddle/hue,MobinRanjbar/hue,kawamon/hue,todaychi/hue,lumig242/Hue-Integration-with-CDAP,cloudera/hue,fangxingli/hue,kawamon/hue,jjmleiro/hue,Peddle/hue,ahmed-mahran/hue,Peddle/hue,kawamon/hue,cloudera/hue,xq262144/hue,hdinsight/hue,MobinRanjbar/hue,kawamon/hue,xq262144/hue,fangxingli/hue,cloudera/hue,fangxingli/hue,jjmleiro/hue,vmax-feihu/hue,cloudera/hue,lumig242/Hue-Integration-with-CDAP,jayceyxc/hue,kawamon/hue,todaychi/hue,jjmleiro/hue,kawamon/hue,kawamon/hue,hdinsight/hue,hdinsight/hue,cloudera/hue,vmax-feihu/hue,cloudera/hue,jayceyxc/hue,cloudera/hue,xq262144/hue,fangxingli/hue,jayceyxc/hue,cloudera/hue,fangxingli/hue,Peddle/hue,jayceyxc/hue,jjmleiro/hue,lumig242/Hue-Integration-with-CDAP,kawamon/hue,jjmleiro/hue,ahmed-mahran/hue,lumig242/Hue-Integration-with-CDAP,cloudera/hue,yoer/hue,MobinRanjbar/hue,kawamon/hue,cloudera/hue