Merge pull request #184 from ringsaturn/master

add tzf-swift

Author: evansiroky

README.md

@@ -135,6 +135,7 @@ A few common languages already have libraries with an API that can be used to lo
 | Ruby | [wheretz](https://github.com/zverok/wheretz)|
 | Rust | [tzf-rs](https://github.com/ringsaturn/tzf-rs) |
 | Rust | [rtz](https://github.com/twitchax/rtz) |
+| Swift | [tzf-swift](https://github.com/ringsaturn/tzf-swift) |
 
 Another common way to use the data for lookup purposes is to load the shapefile into a spatially-aware database.  See this [blog post](https://simonwillison.net/2017/Dec/12/location-time-zone-api/) for an example of how that can be done.