Update repl to later version of Fable

[bilkusg]

As suggested, I am opening this issue to flag the fact that the Repl currently works only against an older version of fable and netstandard, and some things don't work as expected as a result.

Ideally, the repl should be in sync with the currently documented and available stable version of Fable...

I suppose when Fable 2 comes out it would be even nicer to have two versions, one for 2 and one for the currently stable 1.x branch until 2 is ready to replace 1

[alfonsogarciacaro]

There was a regression in the REPL reported for 1.3.8 that I couldn't investigate yet. That's why I was holding the upgrade.

About keeping the two repls, that's a very nice idea. The problem is usually the limited resources we have for implementation and maintenance. Right now I'd like to add a Fulma page-loader so the REPL doesn't look frozen at te beginning, and move type checking to a web worker, but being focused on Fable 2 development, I never find the time to do it :/

[alfonsogarciacaro]

See https://github.com/fable-compiler/repl/commit/a3704d9e564a4118679bad4b1d361d85db5a6999#commitcomment-27996861