Switch to dep for dependency management

vendor/github.com/jessevdk/go-flags/.travis.yml

@@ -1,17 +1,26 @@
 language: go
 
+os:
+  - linux
+  - osx
+
+go:
+  - 1.x
+  - 1.7.x
+  - 1.8.x
+  - 1.9.x
+  - 1.10.x
+
 install:
   # go-flags
   - go get -d -v ./...
   - go build -v ./...
 
   # linting
-  - go get code.google.com/p/go.tools/cmd/vet
-  - go get github.com/golang/lint
-  - go install github.com/golang/lint/golint
+  - go get github.com/golang/lint/golint
 
   # code coverage
-  - go get code.google.com/p/go.tools/cmd/cover
+  - go get golang.org/x/tools/cmd/cover
   - go get github.com/onsi/ginkgo/ginkgo
   - go get github.com/modocache/gover
   - if [ "$TRAVIS_SECURE_ENV_VARS" = "true" ]; then go get github.com/mattn/goveralls; fi