Update PULL_REQUEST_TEMPLATE.md

[ttannis]

Summary of Changes

This PR consolidates the pull request template initially added by @verdan. It's been requested to be updated across all of our repos: amundsen-io/amundsenfrontendlibrary#125 (comment)

Tests

Unit tests not required for template changes.

Documentation

Documentation not required for template changes.

CheckList

Make sure you have checked all steps below to ensure a timely review.

• PR title addresses the issue accurately and concisely. Example: "Updates the version of Flask to v1.0.2"
  • In case you are adding a dependency, check if the license complies with the ASF 3rd Party License Policy.
• PR includes a summary of changes.
• PR adds unit tests, updates existing unit tests, OR documents why no test additions or modifications are needed.
• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public functions and the classes in the PR contain docstrings that explain what it does
• PR passes make test
• I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message"

[codecov-io]

Codecov Report

Merging #41 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #41   +/-   ##
=======================================
  Coverage   74.76%   74.76%           
=======================================
  Files          19       19           
  Lines         939      939           
  Branches       71       71           
=======================================
  Hits          702      702           
  Misses        213      213           
  Partials       24       24

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