Now submitted PRs can automatically linking to Issue if Issue Number is provided

Fixed: #341

All PR-Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open
  Pull Requests for the same
  update/change?

New ✨✨ Feature-Submissions:

• Does your submission pass tests?
• Have you lint your code locally prior to submission?

Changes to ⚙️ Core-Features:

• Have you added an explanation of what your changes do and why you'd like
  us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully run tests with your changes locally?