webpack 5 support

[m-mohr]

Describe the bug
When installing in a project that uses webpack 5 (e.g. STAC Browser), I'm getting the following error when running npm install:

 Could not resolve dependency:
npm WARN peer webpack@"^3.0.0 || ^4.0.0-alpha.0 || ^4.0.0" from [email protected]
npm WARN node_modules/worker-loader
npm WARN   worker-loader@"^2.0.0" from [email protected]
npm WARN   node_modules/georaster
npm WARN
npm WARN Conflicting peer dependency: [email protected]
npm WARN node_modules/webpack
npm WARN   peer webpack@"^3.0.0 || ^4.0.0-alpha.0 || ^4.0.0" from [email protected]
npm WARN   node_modules/worker-loader
npm WARN     worker-loader@"^2.0.0" from [email protected]
npm WARN     node_modules/georaster

Expected behavior
Could we allow webpack 5, too?