Update PR Template to include appropriate details

[mjang]

Based on security checks

- [] If the change involves potentially sensitive changes, I have assessed the possible impact
   - These potentially sensitive changes include: 
      - Changes to code
      - Personally identifying information
      - URLs which may be affected by [typosquatting](https://en.wikipedia.org/wiki/Typosquatting)

Originally posted by @mjang in #52 (comment)

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