chore: update dependencies and devDependencies:

 babel-plugin-transform-es2015-modules-strip   ^0.1.1  →   ^0.1.2
 clean-css-cli                                 ^5.2.1  →   ^5.2.2
 eslint                                       ^7.21.0  →  ^7.22.0
 jsdom                                        ^16.5.0  →  ^16.5.1

Author: mrholek