Updating pull request template

[rishabhshuklax]

Please describe the problem (or idea)

Adding following two points in the PR template:

• [ ] I added tests for the changes I made (if applicable).
• [ ] I added or updated documentation (if applicable).

What's your PublicLab.org username?

rishabhshukla1999

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[rishabhshuklax]

@publiclab/is-reviewers @jywarren @HarshKhandeparkar What are your thoughts?

[YogeshSharma01]

Hi, @blurry-x-face can I work on this?