TS declaration file support

[ttc0419]

Please consider support TS declaration file, the type checker will throw an error currently:

error TS7016: Could not find a declaration file for module 'asciinema-player'. '/xxx/node_modules/asciinema-player/dist/index.js' implicitly has an 'any' type.
  Try `npm i --save-dev @types/asciinema-player` if it exists or add a new declaration (.d.ts) file containing `declare module 'asciinema-player';`

7 import {create} from "asciinema-player"

[septatrix]

See #187. Sadly this does not seem to be on the roadmap