*: update travis to include Go 1.10 and add README badge

Author: ericchiang

.travis.yml

@@ -5,6 +5,7 @@ sudo: required
 go:
   - 1.8
   - 1.9
+  - '1.10'
 
 services:
   - docker

README.md

@@ -1,6 +1,7 @@
 # A simple Go client for Kubernetes
 
 [![GoDoc](https://godoc.org/github.com/ericchiang/k8s?status.svg)](https://godoc.org/github.com/ericchiang/k8s)
+[![Build Status](https://travis-ci.org/ericchiang/k8s.svg?branch=master)](https://travis-ci.org/ericchiang/k8s)
 
 A slimmed down Go client generated using Kubernetes' [protocol buffer][protobuf] support. This package behaves similarly to [official Kubernetes' Go client][client-go], but only imports two external dependencies.