change version (#67)

Author: HarrisChu

scripts/env.sh

@@ -5,7 +5,7 @@ HADOOP_VERSION=3.2.1
 
 scaleFactor=${scaleFactor:-1}
 
-NEBULA_IMPORTER_VERSION=${NEBULA_IMPORTER_VERSION:-master}
-NEBULA_XK6_VERSION=${NEBULA_XK6_VERSION:-master}
+NEBULA_IMPORTER_VERSION=${NEBULA_IMPORTER_VERSION:-v3.1.0}
+NEBULA_XK6_VERSION=${NEBULA_XK6_VERSION:-v1.0.0}
 
 GOLANG_VERSION=${GOLANG_VERSION:-1.16.6}