Issue Summary

The List pull requests REST API endpoint does not include draft pull requests in its response.

Steps to Reproduce

1. Create a draft pull request
2. Use the List pull requests endpoint to fetch open pull requests for the repository: 

   https://api.bitbucket.org/2.0/repositories/{workspace}/{repo_slug}/pullrequests?state=OPEN

Expected Results

The API response should include all open pull requests for the repository, both draft and non-draft.

Actual Results

The response only includes non-draft open PRs, i.e. those with

"draft": false

Workaround

To request draft pull requests from the REST API, format your request like this:

https://api.bitbucket.org/2.0/repositories/{workspace}/{repo_slug}/pullrequests?q=state%3D%22OPEN%22%20AND%20draft%3Dtrue

To request all open pull requests (both draft and non-draft), format your request like this:

https://api.bitbucket.org/2.0/repositories/{workspace}/{repo_slug}/pullrequests?q=state%3D%22OPEN%22%20AND%20(draft%3Dtrue%20OR%20draft%3Dfalse)