publish version 2.1.1

Merge pull request #2 from rksm/master

cleanup event handler to prevent memory leak

publish version 2.1.0

Merge pull request #1 from martin31821/master

Use esModuleInterop and correct import form

Make it possible to use without module bundler

make the rxjs dependency optional

upgrade to rxjs@6.2.0

update electron dependency and imports

fix log message

fix example project

memoize the property getters

split out utils from common

remove usage of ES6 proxy object