Update packages (#655)

* 2.1.0

* Low impact changes (#619)

* dependencies clean-up

* types for child_process' spawnSync

* types for child_process' spawnSync + options fix

* linting

* Relative rootdir (#620)

* relative rootDir support

* relative rootDir support (untrackedFiles behavior changed)

* relative rootDir doc changes

* Cleanup before next pr (#621)

* prettier + sort imports

* splitLines types

* unused package 'connect'

* ucfirst, isOnline types

* ellipsize types

* redundant package 'fs-copy-file-sync'

* removing extra line

* // TODO

* packages dependencies update

* comment fix

* fixes

* nicer ellipsize typing

* better?

* Refactor `inquirer` package (#622)

* regroup `inquirer` into a single file

* fix typo

* linting

* switch to `find-up`

* switch to `find-up` & `strip-bom`

* dependencies update

* findUp implementation fix

* enum accessor fix

* fs-extra & typescript dependency fix

* linting

* dependencies clean-up (again)

* non any cast

* packages update

* del@5.0.0 validated