Update README
Update README

Remove suggestion to set defunct environment variables.
tdenniston/Halide,dan-tull/Halide,kenkuang1213/Halide,rodrigob/Halide,kgnk/Halide,dan-tull/Halide,smxlong/Halide,fengzhyuan/Halide,delcypher/Halide,smxlong/Halide,lglucin/Halide,smxlong/Halide,rodrigob/Halide,lglucin/Halide,rodrigob/Halide,mcanthony/Halide,damienfir/Halide,fengzhyuan/Halide,aam/Halide,psuriana/Halide,jiawen/Halide,adasworks/Halide,dougkwan/Halide,kgnk/Halide,dougkwan/Halide,gchauras/Halide,myrtleTree33/Halide,mcanthony/Halide,dougkwan/Halide,psuriana/Halide,psuriana/Halide,myrtleTree33/Halide,damienfir/Halide,adasworks/Halide,kgnk/Halide,kenkuang1213/Halide,mcanthony/Halide,ronen/Halide,damienfir/Halide,damienfir/Halide,dougkwan/Halide,dan-tull/Halide,smxlong/Halide,fengzhyuan/Halide,kgnk/Halide,jiawen/Halide,delcypher/Halide,aam/Halide,ronen/Halide,psuriana/Halide,lglucin/Halide,smxlong/Halide,kenkuang1213/Halide,ayanazmat/Halide,dougkwan/Halide,delcypher/Halide,fengzhyuan/Halide,gchauras/Halide,adasworks/Halide,lglucin/Halide,dougkwan/Halide,fengzhyuan/Halide,aam/Halide,rodrigob/Halide,mcanthony/Halide,tdenniston/Halide,ayanazmat/Halide,mcanthony/Halide,jiawen/Halide,kgnk/Halide,ronen/Halide,delcypher/Halide,gchauras/Halide,myrtleTree33/Halide,jiawen/Halide,gchauras/Halide,myrtleTree33/Halide,ayanazmat/Halide,dan-tull/Halide,kgnk/Halide,psuriana/Halide,dougkwan/Halide,jiawen/Halide,dougkwan/Halide,kgnk/Halide,kenkuang1213/Halide,gchauras/Halide,ronen/Halide,damienfir/Halide,smxlong/Halide,gchauras/Halide,ayanazmat/Halide,ayanazmat/Halide,ronen/Halide,myrtleTree33/Halide,tdenniston/Halide,lglucin/Halide,adasworks/Halide,aam/Halide,tdenniston/Halide,tdenniston/Halide,adasworks/Halide,aam/Halide,myrtleTree33/Halide,damienfir/Halide,dan-tull/Halide,tdenniston/Halide,mcanthony/Halide,ayanazmat/Halide,kgnk/Halide,lglucin/Halide,kenkuang1213/Halide,myrtleTree33/Halide,mcanthony/Halide,delcypher/Halide,damienfir/Halide,fengzhyuan/Halide,rodrigob/Halide,ayanazmat/Halide,mcanthony/Halide,dan-tull/Halide,tdenniston/Halide,delcypher/Halide,psuriana/Halide,adasworks/Halide,kenkuang1213/Halide,ronen/Halide,rodrigob/Halide,adasworks/Halide,kenkuang1213/Halide,ronen/Halide,delcypher/Halide,kenkuang1213/Halide,smxlong/Halide,jiawen/Halide,tdenniston/Halide,fengzhyuan/Halide,fengzhyuan/Halide,damienfir/Halide,myrtleTree33/Halide,rodrigob/Halide,delcypher/Halide,jiawen/Halide,dan-tull/Halide,ayanazmat/Halide,dan-tull/Halide,aam/Halide,smxlong/Halide,lglucin/Halide,ronen/Halide,adasworks/Halide,aam/Halide,rodrigob/Halide,psuriana/Halide