Merge pull request #1208 from ericchiang/go10

*: update build to Go 1.10

.travis.yml

@@ -5,6 +5,7 @@ sudo: required
 go:
   - 1.8
   - 1.9
+  - '1.10'
 
 go_import_path: github.com/coreos/dex
 

Dockerfile

-FROM golang:1.9.2-alpine
+FROM golang:1.10.0-alpine
 
 RUN apk add --no-cache --update alpine-sdk