fix data race while set prefix (#125)

fix data race in gin handler

README.md

@@ -43,7 +43,7 @@ import (
 	"github.com/gin-gonic/gin"
 	swaggerFiles "github.com/swaggo/files"
 	ginSwagger "github.com/swaggo/gin-swagger"
-	
+
 	_ "github.com/swaggo/gin-swagger/example/basic/docs" // docs is generated by Swag CLI, you have to import it.
 )
 
@@ -86,7 +86,7 @@ import (
 	"github.com/gin-gonic/gin"
 	swaggerFiles "github.com/swaggo/files"
 	ginSwagger "github.com/swaggo/gin-swagger"
-    
+
 	_ "github.com/swaggo/gin-swagger/example/basic/docs" // docs is generated by Swag CLI, you have to import it.
 )
 
@@ -106,8 +106,8 @@ import (
 // @BasePath /v2
 func main() {
 	r := gin.New()
-    
-    // use ginSwagger middleware to 
+
+    // use ginSwagger middleware to
 	r.GET("/swagger/*any", ginSwagger.DisablingWrapHandler(swaggerFiles.Handler, "NAME_OF_ENV_VARIABLE"))
 
 	r.Run()