Deprecated Fields in README example

[wcolburn]

In both the README's example section and in examples/projects.go, "gitlab.CreateProjectOptions" has two deprecated fields: MergeRequestsEnabled and SnippetsEnabled.

I believe this should be updated so the example code is accurate and easy to use for new users.

[Sander van Harmelen]

Feel free to make a PR to update the docs and example 👍🏻

[vntw]

This can be closed with the merge of #1949 I think