Use Golang 1.6

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - 1.5.2
+  - 1.6
   
 before_install:
   - go get golang.org/x/tools/cmd/cover

release/install.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-GO_AMD64=https://storage.googleapis.com/golang/go1.5.3.linux-amd64.tar.gz
-GO_X86=https://storage.googleapis.com/golang/go1.5.3.linux-386.tar.gz
+GO_AMD64=https://storage.googleapis.com/golang/go1.6.linux-amd64.tar.gz
+GO_X86=https://storage.googleapis.com/golang/go1.6.linux-386.tar.gz
 ARCH=$(uname -m)
 GO_CUR=${GO_AMD64}