Update README.md

Author: gunlee01

README.md

@@ -43,6 +43,7 @@ short environment variables similar to other [Zipkin integrations](https://githu
 cd /tmp
 SCOUTER_COLLECTOR_ADDR=127.0.0.1 \
 SCOUTER_COLLECTOR_PORT=6100 \
+SCOUTER_SERVICE_MAPS_OJB_TYPE= \
 STORAGE_TYPE=scouter \
 java -Dloader.path='zipkin-storage-scouter.jar,zipkin-storage-scouter.jar!lib' -Dspring.profiles.active=scouter -cp zipkin.jar org.springframework.boot.loader.PropertiesLauncher
 ```