Remove the is-ready-to-merge question from PR template

GitHub now has "draft" pull requests so all new PR's should either
be draft or ready to merge.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,18 +1,18 @@
-
-**Complete this sentence**
-THIS PULL REQUEST __ [IS/IS NOT] __ READY TO MERGE
+<!-- Is this pull request ready to be merged? -->
+<!-- i.e. tests pass or are expected to fail; all development is finished; appropriate documentation is included. -->
+<!-- If not but opening the pull request will facilitate development, make it a "draft" pull request -->
 
 **Feature or improvement description**
-<A clear and concise description of the new code.>
+<!-- A clear and concise description of the new code. -->
 
 **Related issue, if one exists**
-<Link to a related GitHub Issue.>
+<!-- Link to a related GitHub Issue. -->
 
 **Impacted areas of the software**
-<List any modules or other areas which should be impacted by this pull request. This helps to determine the verification tests.>
+<!-- List any modules or other areas which should be impacted by this pull request. This helps to determine the verification tests. -->
 
 **Additional supporting information**
-<Add any other context about the problem here.>
+<!-- Add any other context about the problem here. -->
 
 **Test results, if applicable**
-<Add the results from unit tests and regression tests here along with justification for any failing test cases.>
+<!-- Add the results from unit tests and regression tests here along with justification for any failing test cases. -->