travis: Remove tip as build target

gofmt seems to have changed behavior at the latest tip (see version info below), which is failing the format check for tls.go file. Disabling it in travis for now. ``` $ go version go version devel +5d4267e480 ```
liam-sun-94 · Apr 24, 2018 · f5888d0 · f5888d0
1 parent ee88dab
commit f5888d0
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diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,8 @@
 language: go
 sudo: required
 go:
+  - 1.9.x
   - 1.10.x
-  - tip
 os:
   - linux
   - osx

diff --git a/appveyor.yml b/appveyor.yml
@@ -5,6 +5,7 @@ clone_folder: c:\gopath\src\github.com\fsouza\go-dockerclient
 environment:
   GOPATH: c:\gopath
   matrix:
+    - GOVERSION: 1.9.5
     - GOVERSION: 1.10.1
 install:
   - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%