- Switch from `crypto.pseudoRandomBytes()` back to `crypto.randomBytes()` (Both are equivalent in Node 4.x and above, and `pseudoRandomBytes()` is deprecated in Node 11.x and above)
- Add `engines` field to _package.json_
- Fix character distribution non-uniformity issue by adding back `-` and `_` to generated ids
- Add character distribution test
- Enable strict mode
- Fix JSDoc optional parameter syntax
- Add `Promise`-based API