[Snyk] Upgrade popper.js from 1.12.9 to 1.16.1

[snyk-bot]

Snyk has created this PR to upgrade popper.js from 1.12.9 to 1.16.1.

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:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 15 versions ahead of your current version.
• The recommended version was released 5 months ago, on 2020-01-22.

Release notes

Package name: popper.js

• 1.16.1 - 2020-01-22
• 1.16.1-lts - 2020-04-06
• 1.16.0 - 2019-10-16
• 1.15.0 - 2019-04-04
• 1.14.7 - 2019-01-29
• 1.14.6 - 2018-11-28
• 1.14.5 - 2018-11-08
• 1.14.4 - 2018-08-03
• 1.14.3 - 2018-04-04
• 1.14.2 - 2018-04-03
• 1.14.1 - 2018-03-13
• 1.14.0 - 2018-03-12
• 1.13.0 - 2017-11-18
• 1.13.0-next.1 - 2017-12-14
• 1.13.0-next - 2017-11-18
• 1.12.9 - 2017-11-15

from popper.js GitHub release notes

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