Fix diagram formatting in README.en.md

Updated the diagram formatting in the README.

Author: AuricTW

README.en.md

@@ -14,16 +14,16 @@ Through a daily automated workflow, it aggregates tracker data from multiple ope
 
 `https://tracker.adysec.com/announce`
 
-arduino
-複製程式碼
-   Client
-      │
-      ▼
-Recommended Tracker
-│
-┌────┼────┼────┐
-▼ ▼ ▼
-A B C
+arduino   
+複製程式碼   
+   Client  
+      │   
+         
+Recommended Tracker   
+│   
+┌────┼────┼────┐   
+▼ ▼ ▼   
+A B C   
 
 markdown
 複製程式碼