complete getting started steps for OS X

You get `multirust: no default toolchain configured` when `multirust default stable` is not executed.
2016-03-20 20:44:32 +01:00 · 2016-03-20 20:44:32 +01:00 · 677193ca52
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@ -25,6 +25,7 @@ curl -sf https://raw.githubusercontent.com/brson/multirust/master/quick-install.
 - OSX with Homebrew:
 ```bash
 brew update && brew install multirust
+multirust default stable
 ```

 Then, download and build Parity: