Updated change log for 5.0.0

Author: sxg

CHANGELOG.md

@@ -2,12 +2,25 @@
 
 ForecastIO adheres to [Semantic Versioning](http://semver.org/).
 
+## 5.0.0
+
+Released on March 30, 2018.
+
+### Added
+- `uvIndex`, `uvIndexTime`, and `windGust` properties on `DataPoint`
+- Support for Danish, Finnish, Japanese, Georgian, Korean, and Romanian
+
+### Updated
+- Swift 4.1 compatibility
+- Max/min temperatures on `DataPoint` are now high/low
+
 ## 4.1.0
 
 Released on March 30, 2018.
 
 ### Added
 - `time`, `regions`, and `severity` properties on `Alert`
+- Support for Bulgarian
 
 ### Updated
 - `Float` properties are now `Double` on `DataPoint` and `Forecast`