add vendor & update README.md

vendor/github.com/boj/redistore/README.md

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+# redistore
+
+[![GoDoc](https://godoc.org/github.com/boj/redistore?status.svg)](https://godoc.org/github.com/boj/redistore)
+[![Build Status](https://travis-ci.org/boj/redistore.svg?branch=master)](https://travis-ci.org/boj/redistore)
+
+A session store backend for [gorilla/sessions](http://www.gorillatoolkit.org/pkg/sessions) - [src](https://github.com/gorilla/sessions).
+
+## Requirements
+
+Depends on the [Redigo](https://github.com/gomodule/redigo) Redis library.
+
+## Installation
+
+    go get gopkg.in/boj/redistore.v1
+
+## Documentation
+
+Available on [godoc.org](http://www.godoc.org/gopkg.in/boj/redistore.v1).
+
+See http://www.gorillatoolkit.org/pkg/sessions for full documentation on underlying interface.
+
+### Example
+``` go
+// Fetch new store.
+store, err := NewRediStore(10, "tcp", ":6379", "", []byte("secret-key"))
+if err != nil {
+	panic(err)
+}
+defer store.Close()
+
+// Get a session.
+session, err = store.Get(req, "session-key")
+if err != nil {
+	log.Error(err.Error())
+}
+
+// Add a value.
+session.Values["foo"] = "bar"
+
+// Save.
+if err = sessions.Save(req, rsp); err != nil {
+	t.Fatalf("Error saving session: %v", err)
+}
+
+// Delete session.
+session.Options.MaxAge = -1
+if err = sessions.Save(req, rsp); err != nil {
+	t.Fatalf("Error saving session: %v", err)
+}
+
+// Change session storage configuration for MaxAge = 10 days.
+store.SetMaxAge(10 * 24 * 3600)
+```