Update CHANGELOG.md

CHANGELOG.md

@@ -1,4 +1,18 @@
 ## [Unreleased](https://github.com/gravitystorm/openstreetmap-carto/compare/v4.4.0...master)
+### Major changes
+- Cleaning up low zoom levels (z5-z7):
+  - Rendering roads from z6 instead of z5
+  - Rendering national parks from z8 instead of z7
+  - Rendering railways from z8 instead of z7
+- Changing parking color from yellow to gray
+
+### Changes
+- Unified rendering of leisure=fitness_station and leisure=fitness_centre 
+- Rendering of military=bunker
+- Rendering all station buildings as major buildings 
+- Text wrapping for station labels
+- Changing windmill color from amenity brown to man_made gray
+- Some other documentation and code changes
 
 ## [v4.4.0](https://github.com/gravitystorm/openstreetmap-carto/compare/v4.3.0...v4.4.0) - 2017-10-20
 ### Major changes