Handful of improvements
- docs: update API docs a6b6e29
- docs(README): update badges link 809b71c
- style: add docblocks 580d673
- chore: use node 12 and latest for CI testing 0d2f670
- refactor: define main field 089ef21
- refactor: fix wrong spelling name of standalone filename 8bf5aad
- refactor: remove _ prefix from private properties b801906
- refactor: rename certain types and interfaces 9138d19
- chore: remove tslint in favor of eslint 05794c2
- chore: update dependencies e1f692f