Hey y'all,
I've been looking at updating this for Swift 4. Looks like a _very_ straightforward update -- the one possible issue is the change in the Swift-facing API due to the addition of existentials (馃帀).

Wanted to double check with y'all about whether just changing the example implementation is the right move here as well as whether or not y'all wanted to wait a little bit on Swift 4 (given that there are still changes being made).
nice 馃憣
i think i'd rather wait until we're out of beta to push this to master
@rnystrom have pushed Swift 4 examples in commit f7220b5cfe2270fabd82bf2c45975c8e9e2253c9
Looks like we're already updated to Swift 4.
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i think i'd rather wait until we're out of beta to push this to master