Update for 0.18

[mgold]

I have removed a mention of this project from the elm-test README since it has not been updated. I'd love to add it back once it gets updated.

I haven't used this project personally, so if there hasn't been any demand for an update, then I can understand why it hasn't happened.

[avh4]

There is a big challenge for the upgrade, which is that the Http module has changed significantly, and some of the new API will be difficult to reimplement for. I've started a branch for this and will publish as soon as possible https://github.com/avh4/elm-testable/tree/elm-0.18

[nineonine]

any update here ?

[avh4]

0.18 support is in the native-rewrite branch, which is working, but needs a few more features ported over before I can release it (which I will be focusing on in the next couple weeks after I get the next elm-format release finished).

[andys8]

@avh4 Thanks for your work. Looking forward to it.

[fobos]

@avh4 You make a great work! I'm waiting for release.