add vendor to travis cache

.travis.yml

@@ -9,13 +9,14 @@ cache:
   directories:
     - $GOPATH/src
     - $GOPATH/pkg
+    - vendor
 
 install:
-  - go get -v github.com/Masterminds/glide 
+  - go get -u github.com/Masterminds/glide 
   - cd $GOPATH/src/github.com/Masterminds/glide && go install && cd -
   - glide install
-  - go get github.com/onsi/gomega
-  - go get github.com/onsi/ginkgo/ginkgo
+  - go get -u github.com/onsi/gomega
+  - go get -u github.com/onsi/ginkgo/ginkgo
 
 script:
   - ginkgo -r --randomizeAllSpecs --randomizeSuites --failOnPending --trace --race --compilers=2