Update PULL_REQUEST_TEMPLATE.md

[manez]

GitHub Issue: Islandora/documentation#1267

What does this Pull Request do?

Points the pull request template at the new team.

How should this be tested?

View file & verify.

Interested parties

@Islandora/8-x-committers

[codecov]

Codecov Report

Merging #87 into dev will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                dev      #87   +/-   ##
=========================================
  Coverage     94.64%   94.64%           
  Complexity      160      160           
=========================================
  Files             9        9           
  Lines           654      654           
=========================================
  Hits            619      619           
  Misses           35       35

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