change default instance type

defaults

@@ -12,6 +12,6 @@
     "STAR_outFilterMismatchNmax": "1",
     "ENDOGENOUS_LIB_PRIORITY": "miRNA,tRNA,gencode,piRNA,circRNA",
     "JAVA_RAM": "10G",
-    "cluster_config": "OnDemand ecs.sn2.large img-ubuntu-vpc",
+    "cluster_config": "OnDemand bcs.ps.g.xlarge img-ubuntu-vpc",
     "disk_size": "200"
 }