chore(vendor) Fetch dep together with dependencies within AppVeyor build

Author: springerigor

appveyor.yml

@@ -33,6 +33,9 @@ install:
   - set Path=c:\go\bin;c:\gopath\bin;C:\Program Files (x86)\Bazaar\;C:\Program Files\Mercurial\%Path%
   - go version
   - go env
+  # Fetch dependencies using `dep`
+  - go get github.com/golang/dep/cmd/dep
+  - dep ensure -v -vendor-only
 
 build: false
 deploy: false
@@ -42,4 +45,4 @@ test_script:
   - ps: c:\gopath\src\github.com\pact-foundation\pact-go\scripts\pact.ps1
 
 artifacts:
-- path: '**\*.log'
+- path: '**\*.log'