Update INSTALL.sh

INSTALL.sh

@@ -794,7 +794,7 @@ configure_docker() {
 
     ### to be removed in 0.1.8
     daemon_json_content='{
-      "storage-driver": "devicemapper"
+      "storage-driver": "devicemapper",
       "log-driver": "local",
       "log-opts": {
          "max-size": "5m"