New parameter `placesToKeep` per discussion in [7](https://github.com/fasiha/mudderjs/issues/7#issuecomment-1132602577). Many thanks to pie6k for patiently explaining the problem to me.
2.0
Build ESM, CommonJS, and IIFE modules
1.1.0
Fixes [16](https://github.com/fasiha/mudderjs/issues/16) so when you ask for 0 strings, you get 0 strings.