Fix wrong order of issues when importing from github
1. What does this MR do?
The order of issues imported from GitHub is fixed.
2. Are there points in the code the reviewer needs to double check?
3. Why was this MR needed?
The default behaviors of GitHub API at listing issues are sort: :created and direction: :desc.
See GitHub API details at https://developer.github.com/v3/issues/#list-issues.
4. What are the relevant issue numbers / Feature requests?
Fixes #1791 (closed)
5. Screenshots (if relevant)