clarify checklist in PR template

[braingram]

This PR changes maintainers to PR authors in the PR template to clarify who should fill out the checklist. I never thought it was me :)

This PR also adds a new item to the checklist:

• All comments are resolved

Checklist for maintainers

• [ ] added entry in CHANGES.rst within the relevant release section
• [ ] updated or added relevant tests
• [ ] updated relevant documentation
• added relevant milestone
• added relevant label(s)
• [ ] ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• [ ] Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.54%. Comparing base (6580914) to head (2fe1df6).
Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8466      +/-   ##
==========================================
+ Coverage   56.38%   56.54%   +0.16%     
==========================================
  Files         387      387              
  Lines       38716    38785      +69     
==========================================
+ Hits        21830    21932     +102     
+ Misses      16886    16853      -33     

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[nden]

We sometimes get PRs from developers external to the organization who don't have permission to set labels or milestones. But if maintainers was confusing I agree it should be changed. May be qualify it with

Checklist for PR authors (skip items if you don't have permissions):

[braingram]

Should we split this into 2 checklists? 1 for items that require permissions which I think are:

• milestones
• regression tests
• labels (although these should get set automatically)
  and one for the PR author (the remaining items).

[braingram]

Thanks! I modified the wording based on your suggestion to hopefully resolve this comment (see db6f096):

**Checklist for PR authors (skip items if you don't have permissions or they are not applicable)**

@nden hopefully this doesn't change your approval. If all looks good to you and @hbushouse feel free to merge.

[hbushouse]

Works for me.