Update README.md

Author: Zhentao-Lin

README.md

@@ -21,8 +21,8 @@
 
 | PCB Version | PCB Picture |
 |-|-|
-| V1.0 | <div style="text-align: center;"><img src='Picture/PCB_V1.0.png' width='30%' alt='V1.0'/></div> |
-| V2.0 | <div style="text-align: center;"><img src='Picture/PCB_V2.0.png' width='30%' alt='V2.0'/></div> |
+| V1.0 | <center><img src='Picture/PCB_V1.0.png' width='30%' alt='V1.0'/></center> |
+| V2.0 | <center><img src='Picture/PCB_V2.0.png' width='30%' alt='V2.0'/></center> |
 
 
 ### Download
@@ -93,4 +93,4 @@ Our services include:
 
 Our code and circuit are open source. You can obtain the details and the latest information through visiting the following web site:
 
-http://www.freenove.com
+http://www.freenove.com