fix: upgrade popper.js from 1.12.5 to 1.16.1

Snyk has created this PR to upgrade popper.js from 1.12.5 to 1.16.1.

See this package in NPM:
https://www.npmjs.com/package/popper.js

See this project in Snyk:
https://app.snyk.io/org/coderbyheart/project/a5aa72bb-b5d9-4dec-adc9-3238d3e5caa9?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -31,7 +31,7 @@
     "font-awesome": "^4.7.0",
     "jquery": "^3.4.1",
     "meownica-web-fonts-loader": "^1.2.1",
-    "popper.js": "^1.12.5",
+    "popper.js": "^1.16.1",
     "react": "^16.0.0",
     "react-dom": "^16.0.0"
   },