Out of date flags in the Development Guide section of the wiki

[seanchen1991]

After forking and attempting to run cargo test --features unstable locally, I get a rayon does not have these features: unstable error. Running without the unstable flag seems to work perfectly fine; no warnings about dead code in sight. I can go and update the cargo commands in the wiki if y'all are fine with removing the --features unstable flag.

[cuviper]

Hmm, yes, we switched that to a manual cfg flag a while ago (#371). These days it's only used for futures integration, which is why it's only described in the rayon-futures README. We no longer need to advise using that all the time. You can now also use stable rustc for testing and the demos, although I suppose you still need nightly for benchmarks.

[nikomatsakis]

We have a wiki? :) I forgot all about that.

[nikomatsakis]

I removed the mention of --features unstable, at least. Closing this issue for now. Thanks @seanchen1991 !