Create PULL_REQUEST_TEMPLATE.md

Author: feross

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+  Proposing a new rule or a rule change? Please open an issue here first:
+  https://github.com/standard/standard/issues
+  
+  If the rule has been accepted and you want to send a PR, please send it
+  to: https://github.com/standard/standard. Add the rule to the
+  'eslintrc.json' file, in the "rules" field. This is where rules live
+  until a new major version of standard is released, at which point all
+  new rules and rule changes are moved into eslint-config-standard.
+-->