Update pull_request_template.md

[lpatmo]

Background/Context

Updates the PR template! Context: discussion in #158 (reply in thread)

Before and After

Before:

After:
Something closer to this:

Acknowledgments (optional)

@BethanyG for the updated draft

Other notes (optional)

N/A

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@9f7cb65). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #159   +/-   ##
=======================================
  Coverage        ?   83.70%           
=======================================
  Files           ?       29           
  Lines           ?      491           
  Branches        ?        0           
=======================================
  Hits            ?      411           
  Misses          ?       80           
  Partials        ?        0           

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[BethanyG]

Gah. Apologies for the individual delete suggestions. The interface wouldn't let me do a multi-line suggestion there for some reason. The purpose of the re-ordering is to get at what I think might be the most "common" tasks. I also removed "enhancement". I think "enhancements" are more or less a feature, the only difference being the "size" -- i.e., the addition of code that doesn't specifically address a bug. My thinking is the fewer the categories, the easier it is to fill out.

[lpatmo]

Thanks @BethanyG for the feedback/commit suggestions!