Fix README.md display problems (#223)

Signed-off-by: xiaolong.ran <ranxiaolong716@gmail.com>
diff --git a/README.md b/README.md
index 5de1b73..e7a8bc3 100644
--- a/README.md
+++ b/README.md
@@ -108,7 +108,7 @@
         This is an example:
         
         ```
-	docker pull apachepulsar/pulsar-manager:v0.1.0
+	    docker pull apachepulsar/pulsar-manager:v0.1.0
         docker run -it -p 9527:9527 -e REDIRECT_HOST=http://192.168.0.104 -e REDIRECT_PORT=9527 -e DRIVER_CLASS_NAME=org.postgresql.Driver -e URL='jdbc:postgresql://127.0.0.1:5432/pulsar_manager' -e USERNAME=pulsar -e PASSWORD=pulsar -e LOG_LEVEL=DEBUG -v $PWD:/data apachepulsar/pulsar-manager:v0.1.0 /bin/sh
         ```
 
@@ -121,6 +121,7 @@
         ```
 
         (2) Build and start the backend.
+        
         ```
         cd pulsar-manager
         ./gradlew build -x test