upgrade version to 0.20.20

Author: gy2006

core/src/main/resources/application.properties

@@ -2,7 +2,7 @@ logging.level.org.apache.zookeeper=ERROR
 logging.level.org.apache.curator.framework=ERROR
 logging.level.com.flowci.core=${FLOWCI_LOG_LEVEL:INFO}
 
-info.app.version=0.20.16
+info.app.version=0.20.20
 info.app.name=flow.ci
 
 server.port=${FLOWCI_SERVER_PORT:8080}