Merge pull request #65 from rosenhouse/golang-to-1.9

Golang versions: add 1.9, drop 1.7

.travis.yml

@@ -3,8 +3,8 @@ sudo: required
 dist: trusty
 
 go:
-  - 1.7.x
   - 1.8.x
+  - 1.9.x
 
 env:
   global:

Vagrantfile

@@ -12,7 +12,7 @@ Vagrant.configure(2) do |config|
     apt-get update -y || (sleep 40 && apt-get update -y)
     apt-get install -y git
 
-    wget -qO- https://storage.googleapis.com/golang/go1.8.3.linux-amd64.tar.gz | tar -C /usr/local -xz
+    wget -qO- https://storage.googleapis.com/golang/go1.9.1.linux-amd64.tar.gz | tar -C /usr/local -xz
 
     echo 'export GOPATH=/go' >> /root/.bashrc
     echo 'export PATH=$PATH:/usr/local/go/bin:$GOPATH/bin' >> /root/.bashrc