Migrate from dep to go module

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/github.com/onsi/ginkgo/CONTRIBUTING.md

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+# Contributing to Ginkgo
+
+Your contributions to Ginkgo are essential for its long-term maintenance and improvement.
+
+- Please **open an issue first** - describe what problem you are trying to solve and give the community a forum for input and feedback ahead of investing time in writing code!
+- Ensure adequate test coverage:
+    - When adding to the Ginkgo library, add unit and/or integration tests (under the `integration` folder).
+    - When adding to the Ginkgo CLI, note that there are very few unit tests.  Please add an integration test.
+- Update the documentation. Ginko uses `godoc` comments and documentation on the `gh-pages` branch.
+  If relevant, please submit a docs PR to that branch alongside your code PR.
+
+Thanks for supporting Ginkgo!
+
+## Setup
+
+Fork the repo, then:
+
+```
+go get github.com/onsi/ginkgo
+go get github.com/onsi/gomega/...
+cd $GOPATH/src/github.com/onsi/ginkgo
+git remote add fork git@github.com:<NAME>/ginkgo.git
+
+ginkgo -r -p   # ensure tests are green
+go vet ./...   # ensure linter is happy
+```
+
+## Making the PR
+ - go to a new branch `git checkout -b my-feature`
+ - make your changes
+ - run tests and linter again (see above)
+ - `git push fork`
+ - open PR 🎉