@morphic-ts/adt undefined dependency on tslib

[akomm]

@morphic-ts/adt has a dependency on tslib but does not define it.

Compiling project with @morphic-ts/adt fails with:

Error: Cannot find module 'tslib'
Require stack:
- /<project>/node_modules/@morphic-ts/adt/lib/index.js

You maybe missed it because if you test with other packages installed, which have tslib, you will not see the error. Specifically, this mono-repo has tslib as devDep