Fix minor issue abbot#37 with example in README.md and gofmt users.go

Author: abbot

README.md

@@ -24,9 +24,10 @@ This is a complete working example for Basic auth:
     package main
 
     import (
-            "github.com/abbot/go-http-auth"
             "fmt"
             "net/http"
+
+            auth "github.com/abbot/go-http-auth"
     )
 
     func Secret(user, realm string) string {

users.go

@@ -6,11 +6,11 @@ import (
 	"sync"
 )
 
-/* 
+/*
  SecretProvider is used by authenticators. Takes user name and realm
  as an argument, returns secret required for authentication (HA1 for
  digest authentication, properly encrypted password for basic).
- 
+
  Returning an empty string means failing the authentication.
 */
 type SecretProvider func(user, realm string) string