pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+* Make sure you're using a special branch just for this pull request. (Sometimes people unknowingly update their submission branch, which updates the pull request with other changes.)
+* Do NOT update the version number in the file. (This just causes conflicts.)
+* Do add your name to the list of contributors. (Don't worry about the formatting.) I'll try to remember to add it if you don't, but I sometimes forget as it's an extra step.
+
+If you get something above wrong, don't fret it, it's not the end of the world.