import popper.js

Signed-off-by: Nico Schottelius <nico@nico-notebook.schottelius.org>

assets/u/static/popper.js-1.16.0/.github/ISSUE_TEMPLATE.md

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+<!--
+Thanks for your interest in contributing to Popper.js!  
+If your issue is not a bug report, please use our community at https://spectrum.chat/popper-js
+
+Please, make sure to fill all the sections of the template before submitting any issue. 
+
+Issues without the required informations WILL BE CLOSED.
+
+Want your issue to be fixed earlier? Create a PR that introduces a CI test that fails
+because of the bug you found!
+-->
+
+### CodePen demo
+
+<!--
+Use this CodePen template to allow the contributors to easily reproduce your problem.  
+-->
+
+https://codepen.io/pen?template=wGqJEz
+
+### Steps to reproduce the problem
+
+1.  
+2.  
+3.  
+
+### What is the expected behavior?
+
+<!-- Describe what you would have expected. -->
+
+### What went wrong?
+
+<!-- Describe what went wrong. -->
+
+### Any other comments?
+
+<!-- Any additional information. -->

assets/u/static/popper.js-1.16.0/.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for your interest in contributing to Popper.js!
+
+Please, make sure to fulfill the following conditions before submitting your Pull Request:
+
+1. Make sure the tests are passing by running `yarn test` with Google Chrome installed.
+
+2. Add any relevant tests to cover the code you have changed and/or added.
+
+3. If you change the public API, try to update the Typescript definitions accordingly:
+  https://github.com/FezVrasta/popper.js/blob/master/packages/popper/index.d.ts
+  This is not required but will help a lot. Mention @giladgray for help as needed.
+
+
+Problems signing the CLA? Try this link:
+https://cla-assistant.io/FezVrasta/popper.js
+-->