Move to Go 1.6 and set CGO_ENABLED=0 in tests

.travis.yml

 language: go
 
 go:
-  - 1.4.3
-  - 1.5.3
+  - 1.6
   - tip
 
+env:
+- CGO_ENABLED=0
+
 install:
-  - go get -d ./...
+  - go get -t ./...
   - go get golang.org/x/tools/cmd/vet
 
 script:

README.md

@@ -96,7 +96,7 @@ You may also be interested in the [developer guide]
 
 ## Running from Source
 
-Note: You will need **[Go 1.4](https://golang.org/dl/)** or a later version.
+Note: You will need **[Go 1.6](https://golang.org/dl/)** or newer.
 
 1. `$ go get github.com/mholt/caddy`
 2. `cd` into your website's directory

appveyor.yml

@@ -6,13 +6,14 @@ clone_folder: c:\gopath\src\github.com\mholt\caddy
 
 environment:
   GOPATH: c:\gopath
+  CGO_ENABLED: 0
 
 install:
   - go get golang.org/x/tools/cmd/vet
   - echo %GOPATH%
   - go version
   - go env
-  - go get -d ./...
+  - go get -t ./...
 
 build_script:
   - go vet ./...