diff --git a/.travis.yml b/.travis.yml
index 6af9fb4..c184317 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: go
 go:
-  - 1.6.2
+  - 1.8
 before_install:
   - sudo pip install codecov
 install:
diff --git a/README.md b/README.md
index c7f7723..8f8c61d 100644
--- a/README.md
+++ b/README.md
@@ -1,24 +1,24 @@
 go-iap
 ======
 
+![](https://img.shields.io/badge/golang-1.8.0-blue.svg?style=flat)
 [![Build Status](https://travis-ci.org/dogenzaka/go-iap.svg?branch=master)](https://travis-ci.org/dogenzaka/go-iap)
 [![codecov.io](https://codecov.io/github/dogenzaka/go-iap/coverage.svg?branch=master)](https://codecov.io/github/dogenzaka/go-iap?branch=master)
 
-go-iap verifies the purchase receipt via AppStore or GooglePlayStore.
+go-iap verifies the purchase receipt via AppStore, GooglePlayStore or Amazon AppStore.
 
 Current API Documents:
 
 * AppStore: [![GoDoc](https://godoc.org/github.com/dogenzaka/go-iap/appstore?status.svg)](https://godoc.org/github.com/dogenzaka/go-iap/appstore)
 * GooglePlay: [![GoDoc](https://godoc.org/github.com/dogenzaka/go-iap/playstore?status.svg)](https://godoc.org/github.com/dogenzaka/go-iap/playstore)
-
 * Amazon AppStore: [![GoDoc](https://godoc.org/github.com/dogenzaka/go-iap/amazon?status.svg)](https://godoc.org/github.com/dogenzaka/go-iap/amazon)
 
 
 # Dependencies
 ```
-go get github.com/parnurzeal/gorequest
 go get golang.org/x/net/context
 go get golang.org/x/oauth2
+go get golang.org/x/oauth2/google
 go get google.golang.org/api/androidpublisher/v2
 ```
 
@@ -26,6 +26,7 @@ go get google.golang.org/api/androidpublisher/v2
 ```
 go get github.com/dogenzaka/go-iap/appstore
 go get github.com/dogenzaka/go-iap/playstore
+go get github.com/dogenzaka/go-iap/amazon
 ```