add missing type exports

[jwetzell]

With a fresh angular project created using ng new peerjs-test and the installing the peerjs library npm install --save peerjs trying to import the library via import {Peer} from 'peerjs' results in the following error.

Error: ../peerjs/dist/types.d.ts:49:1 - error TS1046: Top-level declarations in .d.ts files must start with either a 'declare' or 'export' modifier.

49 enum LogLevel {

adding the missing types to the exports.ts causes them to be exported in the resulting types.d.ts file which resolves this build issue.

[Praveenjana20]

fix for #961

[github-actions]

🎉 This PR is included in version 1.4.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[jonasgloning]

Thank you both very much! Especially for the PR.

[jwetzell]

No problem! Glad I could contribute, and thanks for the quick review and merge!