This release introduces support for async methods in applications.
Other notable changes include fixes for ExpiringMap storage,
reconnection, argument output in the CLI, support for passing additional
info in errors, and introduction of the package documentation and
tutorial.

Notable changes:

- lib: fix invalid args handling in reconnectFn() (Mykola Bilochub)
- lib: fix ExpiringMap internal storage growing (Mykola Bilochub)
- docs: use mkdocs for documentation (Mykola Bilochub)
- cli: improve args serialization (Mykola Bilochub)
- docs: add tutorial to documentation (mille-nium)
- lib: add support for custom error serialization (Mykola Bilochub)
- lib: allow passing additional info to RemoteError (Mykola Bilochub)
- lib: add support for async methods in Applications (Mykola Bilochub)

PR-URL: https://github.com/metarhia/jstp/pull/426
Reviewed-By: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>