Bumps Go version to 1.8.

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - 1.7.5
+  - 1.8
 
 branches:
   only:

README.md

@@ -42,7 +42,7 @@ https://www.consul.io/docs
 ## Developing Consul
 
 If you wish to work on Consul itself, you'll first need [Go](https://golang.org)
-installed (version 1.7+ is _required_). Make sure you have Go properly installed,
+installed (version 1.8+ is _required_). Make sure you have Go properly installed,
 including setting up your [GOPATH](https://golang.org/doc/code.html#GOPATH).
 
 Next, clone this repository into `$GOPATH/src/github.com/hashicorp/consul` and
@@ -64,7 +64,7 @@ format the code according to Go standards.
 
 ### Building Consul on Windows
 
-Make sure Go 1.7+ is installed on your system and that the Go command is in your
+Make sure Go 1.8+ is installed on your system and that the Go command is in your
 %PATH%.
 
 For building Consul on Windows, you also need to have MinGW installed.

scripts/consul-builder/Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:trusty
 
-ENV GOVERSION 1.7.5
+ENV GOVERSION 1.8
 
 RUN apt-get update -y && \
     apt-get install --no-install-recommends -y -q \