add issue and pull request templates

Author: Qix-

.github/ISSUE_TEMPLATE.md

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+<!--
+
+DO NOT SUBMIT ISSUES ASKING TO REMOVE ES6.
+
+IT WILL BE CLOSED.
+IT WILL BE LOCKED.
+
+We use ES2015+ for a reason. Modern best
+practices dictate the use of tooling like
+Babel and @babel/preset-env in order to
+target the browsers that make sense for
+your project.
+
+For more information, please see:
+https://github.com/visionmedia/debug/pull/672
+
+-->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+
+DO NOT SUBMIT PULL REQUESTS REMOVING ES6.
+
+IT WILL BE CLOSED.
+IT WILL NOT BE MERGED.
+
+We use ES2015+ for a reason. Modern best
+practices dictate the use of tooling like
+Babel and @babel/preset-env in order to
+target the browsers that make sense for
+your project.
+
+For more information, please see:
+https://github.com/visionmedia/debug/pull/672
+
+-->