Support default state, remove "constate" dependency

• Default state support added. It is helpful in case you do not need to call any actions within some of your tests, but components within the test use "react-localux".
• Bundle size reduced to 1.8 Kb thanks to "constate" removing as a dependency.

Up deps + TS 3.5 fix

2.2.0

Fix upgrade to TS 3.5