Change the indentation to 4 spaces in README.

README.md

@@ -20,19 +20,19 @@ go get github.com/gin-contrib/authz
 package main
 
 import (
-	"net/http"
+    "net/http"
 
-	"github.com/casbin/casbin"
-	"github.com/gin-contrib/authz"
-	"github.com/gin-gonic/gin"
+    "github.com/casbin/casbin"
+    "github.com/gin-contrib/authz"
+    "github.com/gin-gonic/gin"
 )
 
 func main() {
-	// load the casbin model and policy from files, database is also supported.
-	e := casbin.NewEnforcer("authz_model.conf", "authz_policy.csv")
+    // load the casbin model and policy from files, database is also supported.
+    e := casbin.NewEnforcer("authz_model.conf", "authz_policy.csv")
 
-	// define your router, and use the Casbin authz middleware.
-	// the access that is denied by authz will return HTTP 403 error.
+    // define your router, and use the Casbin authz middleware.
+    // the access that is denied by authz will return HTTP 403 error.
     router := gin.New()
     router.Use(authz.NewAuthorizer(e))
 }