Merge pull request #2338 from Roasbeef/pr-template

github: add PR contribution checklist

.github/pull_request_template.md

@@ -0,0 +1,19 @@
+#### Pull Request Checklist
+
+- [ ] All changes are Go version 1.11 compliant
+- [ ]  The code being submitted is commented according to the
+  [Code Documentation and Commenting](#CodeDocumentation) section
+- [ ]  For new code: Code is accompanied by tests which exercise both
+  the positive and negative (error paths) conditions (if applicable)
+- [ ]  For bug fixes: Code is accompanied by new tests which trigger
+  the bug being fixed to prevent regressions
+- [ ]  Any new logging statements use an appropriate subsystem and
+  logging level
+- [ ]  Code has been formatted with `go fmt`
+- [ ]  For code and documentation: lines are wrapped at 80 characters
+  (the tab character should be counted as 8 characters, not 4, as some IDEs do
+  per default)
+- [ ]  Running `make check` does not fail any tests
+- [ ]  Running `go vet` does not report any issues
+- [ ]  Running `make lint` does not report any **new** issues that did not
+  already exist