feat: add Immutable v4 compatibility (#61)

* fix: pass type check for Record in Immutable v4
* fix: extracting keys from Record in Immutable v4
* refactor: change warning to better reflect Immutable v4 types
* docs: better reflect both Immutable v3 and v4 types
* docs: replace Immutable.Iterable with Immutable.Collection

BREAKING CHANGE:

* build: change dependency type for immutable and extend version supported

feat: allow to use Record and other Iterables as default state value (#…

…58)

* fix: correct test glob pattern

* feat: allow using custom default state

* test: add tests for custom default state

* docs: update README with custom default state usage

fix: make flow-runtime a dev dependency (#57)

chore: release 3.0.10

chore: release 3.0.9

3.0.8

3.0.7

3.0.6

3.0.2

3.0.1