switch from json-schema-ref-parser's bundle method to dereference

[c0dingn0mad]

Fix / work-around for Issue 311

[RomanHotsiy]

@vegyraupe thanks for this PR.
But it makes unit tests fail. I will investigate though.
But, could you please verify if the issue #113 still occurs on the 2.0.0-alpha.1.
It is complete ReDoc rewrite using React so the issue may be fixed now.

Thanks!

[c0dingn0mad]

@RomanGotsiy I tried with alpha.5 and the error still occurs. Switching bundle to dereference works again. The problem occurs when the same external reference is being used twice. This results in bundle to only include it once and returning a relative reference instead of the dereferenced object.

[RomanHotsiy]

@vegyraupe could you share your spec? or at least minimal reproducible sample?

[RomanHotsiy]

Closing this as stale