fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - @babel/plugin-proposal-class-properties from 7.10.4 to 7.12.1.
    See this package in npm: https://www.npmjs.com/package/@babel/plugin-proposal-class-properties
  - @babel/plugin-proposal-object-rest-spread from 7.11.0 to 7.12.1.
    See this package in npm: https://www.npmjs.com/package/@babel/plugin-proposal-object-rest-spread
  - @babel/plugin-transform-property-literals from 7.10.4 to 7.12.1.
    See this package in npm: https://www.npmjs.com/package/@babel/plugin-transform-property-literals
  - @babel/polyfill from 7.11.5 to 7.12.1.
    See this package in npm: https://www.npmjs.com/package/@babel/polyfill

See this project in Snyk:
https://app.snyk.io/org/randytarampi/project/e095fb25-a87f-4931-a0ba-08adee4c492b?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -22,10 +22,10 @@
   "devDependencies": {
     "@babel/cli": "^7.11.6",
     "@babel/core": "^7.11.6",
-    "@babel/plugin-proposal-class-properties": "^7.10.4",
-    "@babel/plugin-proposal-object-rest-spread": "^7.11.0",
-    "@babel/plugin-transform-property-literals": "^7.10.4",
-    "@babel/polyfill": "^7.11.5",
+    "@babel/plugin-proposal-class-properties": "^7.12.1",
+    "@babel/plugin-proposal-object-rest-spread": "^7.12.1",
+    "@babel/plugin-transform-property-literals": "^7.12.1",
+    "@babel/polyfill": "^7.12.1",
     "@babel/preset-env": "^7.11.5",
     "@babel/register": "^7.11.5",
     "@semantic-release/changelog": "^5.0.1",