Update dependency popper.js to v1.16.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
popper.js (source)	dependencies	minor	1.14.6 -> 1.16.0

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Release Notes

FezVrasta/popper.js

v1.16.0

Compare Source

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

v1.15.0

Compare Source

• fix(types): add missing reference and popper class properties (#​759)
• fix: add "unpkg" field to package.json to link to minified version (#​758)
• feat: add 'flipVariationsByContent' option to flip modifier (#​754)

v1.14.7

Compare Source

• fix: TS and Flow types for preventOverflow and flip modifiers;

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