Improve PR and Issue templates. (#822)

* Improve PR and Issue templates.
- Add instructions as template comments.
- Fix misunderstanding of how labels work.

* insignificant change to try and unstick travis status

Author: n2ygk

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report to help us improve
 title: ''
-labels: bug, docs, api
+labels: bug
 assignees: ''
 
 ---
@@ -20,6 +20,7 @@ assignees: ''
 <!-- Version of django-oauth-toolkit -->
 
 <!-- Have you tested with the latest version and/or master branch? -->
+<!-- Replace '[ ]' with '[x]' to indicate that. -->
 - [ ] I have tested with the latest published release and it's still a problem.
 - [ ] I have tested with the master branch and it's still a problem.
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: enhancement, good first issue, docs, help-wanted
+labels: enhancement
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/question.md

@@ -2,7 +2,7 @@
 name: Question
 about: Ask a question about using django-oauth-toolkit
 title: ''
-labels: question, help-wanted
+labels: question
 assignees: ''
 
 ---

.github/pull_request_template.md

@@ -1,9 +1,14 @@
+<!-- See  https://django-oauth-toolkit.readthedocs.io/en/latest/contributing.html#pull-requests -->
+<!-- If there's already an issue that this PR fixes, add that issue number below after 'Fixes #' -->
 Fixes #
 
 ## Description of the Change
 
 ## Checklist
 
+<!-- Replace '[ ]' with '[x]' to indicate that the checklist item is completed. -->
+<!-- You can check the boxes now or later by just clicking on them. -->
+
 - [ ] PR only contains one change (considered splitting up PR)
 - [ ] unit-test added
 - [ ] documentation updated