Require Go 1.7 and newer.

That's the minimum version that has context package in standard
library, and built-in support for it inside net/http package.

Now that Go 1.8 is out, this "current version, plus one back".

Author: dmitshur

.travis.yml

@@ -1,18 +1,12 @@
 sudo: false
 language: go
 go:
-  - 1.5.4
-  - 1.6.3
-  - 1.7
-  - tip
+  - 1.7.x
+  - 1.8.x
+  - master
 matrix:
-  include:
-    - go: 1.4.3
-      script:
-        - go get -t -v ./...
-        - go test -v -race ./...
   allow_failures:
-    - go: tip
+    - go: master
   fast_finish: true
 install:
   - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).

README.md

@@ -7,7 +7,7 @@ go-github is a Go client library for accessing the [GitHub API][].
 **Build Status:** [![Build Status](https://travis-ci.org/google/go-github.svg?branch=master)](https://travis-ci.org/google/go-github)  
 **Test Coverage:** [![Test Coverage](https://coveralls.io/repos/google/go-github/badge.svg?branch=master)](https://coveralls.io/r/google/go-github?branch=master) ([gocov report](https://drone.io/github.com/google/go-github/files/coverage.html))
 
-go-github requires Go version 1.4 or greater.
+go-github requires Go version 1.7 or greater.
 
 ## Usage ##