fix: upgrade multiple dependencies with Snyk
fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - react from 16.3.2 to 16.13.1.
    See this package in NPM: https://www.npmjs.com/package/react
  - react-dom from 16.3.2 to 16.13.1.
    See this package in NPM: https://www.npmjs.com/package/react-dom

See this project in Snyk:
https://app.snyk.io/org/rom1504/project/0e5c2b64-96b1-4d5f-81fe-87e9258bd21c?utm_source=github&utm_medium=upgrade-pr
PrismarineJS/prismarinejs.github.io,PrismarineJS/prismarinejs.github.io