v1.2.0

update changelog

improve exported types

+vscode settings

test with node 10

update devdeps

Merge pull request #25 from raoulj/update-typing

Update TS typedef to parametrize key type

Merge pull request #24 from Macil/greenkeeper/mocha-7.0.1

chore(package): update lockfile yarn.lock

chore(package): update mocha to version 7.0.1

Merge pull request #23 from Macil/greenkeeper/rimraf-3.0.0

chore(package): update lockfile

chore(package): update rimraf to version 3.0.0

Merge pull request #22 from Macil/greenkeeper/eslint-6.0.0