Updating the PR template to match our usage (#904)

* This had some boilerplate wording that I've updated to what we want
  done before each PR is ready for review

Co-authored-by: Tyler Ruppert <{ID}+{username}@users.noreply.github.com>

.github/pull_request_template.md

@@ -8,8 +8,8 @@ _A short paragraph on test what exactly this PR solves._
 
 # Testing completed
 
-- [ ] _a list of actions that you've performed to ensure that this PR works as intended_
-- [ ] _99% of the times you should have an item: "wrote tests"_
+- [ ] test coverage exists or has been added/updated
+- [ ] tested in a private testnet
 
 # Breaking changes