Mykola Bilochub

Drop support for Node.js versions older than 8.0

1

Also, add Node.js 12 to the Travis CI configuration, update test for `async` application methods, and apply some syntactic sugar that was unavailable before.

We still haven't updated the protocol documentation in 'advanced' part of the documentation: https://github.com/metarhia/jstp/blob/master/doc/advanced/protocol.md Refs: #163

See https://github.com/metarhia/jstp/pull/246 for details.

Create document with contribution guidelines

3

See https://github.com/metarhia/JSTP/pull/153#issuecomment-300580608.

I think it would be very useful to have a fuzzer built-in as a part of this package since fuzz testing helps with the detection of significant bugs and security...