Update dependency popper.js to v1.16.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
popper.js (source)	dependencies	minor	1.15.0 -> 1.16.0

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Release Notes

FezVrasta/popper.js

### [`v1.16.0`](https://togithub.com/FezVrasta/popper.js/releases/v1.16.0) [Compare Source](https://togithub.com/FezVrasta/popper.js/compare/v1.15.0...v1.16.0) - 🚀 feat: referenceNode support for reference objects (closes [#​800](https://togithub.com/FezVrasta/popper.js/issues/800)) ([#​801](https://togithub.com/FezVrasta/popper.js/issues/801)) (thanks [@​Benjamin-Dobell](https://togithub.com/Benjamin-Dobell)) - 🛠 fix: make browser detection more reliable ([#​768](https://togithub.com/FezVrasta/popper.js/issues/768)) (thanks [@​mrzepinski](https://togithub.com/mrzepinski)) - 🛠 fix: Remove /src from .npmignore (for debugging) ([#​761](https://togithub.com/FezVrasta/popper.js/issues/761)) (thanks [@​justingrant](https://togithub.com/justingrant)) - 🛠 fix: calculation that results in NaN ([#​790](https://togithub.com/FezVrasta/popper.js/issues/790)) (thanks [@​snoozbuster](https://togithub.com/snoozbuster)) - 🛠 fix: ESM style export of Padding in TS typedefs ([#​802](https://togithub.com/FezVrasta/popper.js/issues/802)) (thanks [@​Benjamin-Dobell](https://togithub.com/Benjamin-Dobell)) - 🛠 fix: `.js.flow` definitions ([#​829](https://togithub.com/FezVrasta/popper.js/issues/829)) (thanks [@​pascalduez](https://togithub.com/pascalduez)) - ⚡️ perf: declared packages side effect free and fixed existing side effects ([#​830](https://togithub.com/FezVrasta/popper.js/issues/830)) (thanks [@​maclockard](https://togithub.com/maclockard)) - 📖 docs: add complete live example - 📖 docs: HTTPS codepen link ([#​795](https://togithub.com/FezVrasta/popper.js/issues/795)) (thanks [@​coliff](https://togithub.com/coliff)) - 📖 docs: fix typo in destroy.js comment ([#​810](https://togithub.com/FezVrasta/popper.js/issues/810)) (thanks [@​XhmikosR](https://togithub.com/XhmikosR)) - 🏡 chore: upgrade lerna ([#​803](https://togithub.com/FezVrasta/popper.js/issues/803)) (thanks [@​jquense](https://togithub.com/jquense))

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