docs: Update syntax highlight in Readme (#234)

ddaza · web-flow · commit e8253f109941 · 2023-10-09T10:36:10.000+08:00
diff --git a/README.md b/README.md
@@ -291,7 +291,7 @@ func main() {
 ```
 
 #### mongo-driver
-```
+```go
 package main
 
 import (
