Update documentation

README.md

@@ -594,6 +594,7 @@ public static final int STATE_TIME_OUT = 5; // connection timed out
 ```
 
 ## Version History
+
 | Version number | Update time | Author | Update information
 | ---- | --- | ----- | -----
 | 1.0   | 2017/02/15 | Suzy | Preliminary version
@@ -620,6 +621,7 @@ public static final int STATE_TIME_OUT = 5; // connection timed out
 | 1.2.3 | 2020/4/2 | Xing | Add key verification, modify the dependent environment to androidx
 | 1.2.4 | 2020/4/10 | Xing | Fix known bugs
 
+
 ## FAQ
 
 - How to judge whether the currently scanned BroadData (device) is a broadcast scale or a connected scale?
@@ -682,4 +684,4 @@ Phone: 0755-81773367
 
 Official website: www.elinkthings.com
 
-Email: app@elinkthings.com
+Email: app@elinkthings.com