Update changelog with regard to 4.9.1

CHANGELOG.md

@@ -1,9 +1,49 @@
 # 5.0.0
+   Changes with regard 5.0.0 RC2:
    - API:
      - if `geometry=geojson` is passed the resulting geometry can be a LineString or Point
        depending on how many coordinates are present.
      - the removal of the summary field was revered. for `steps=flase` the field will always be an empty string.
 
+   Changes with regard to 4.9.1:
+   - API:
+     - BREAKING: Complete rewrite of the HTTP and library API. See detailed documentation in the wiki.
+     - BREAKING: The default coordinate order is now `longitude, latidue`. Exception: Polyline geometry
+         which follow the original Google specification of `latitdue, longitude`.
+     - BREAKING: Polyline geometries now use precision 5, instead of previously 6
+     - BREAKING: Removed GPX support
+     - New service `tile` which serves debug vector tiles of the road network
+     - Completely new engine for guidance generation:
+        - Support for highway ramps
+        - Support for different intersection types (end of street, forks, merges)
+        - Instruction post-processing to merge unimportant instructions
+        - Improved handling of roundabouts
+
+   - Tools:
+     - BREAKING: Renamed osrm-prepare to osrm-contract
+     - BREAKING: Removes profiles from osrm-contract, only needed in osrm-extract.
+     - Abort processing in osrm-extract if there are no snappable edges remaining.
+     - Added .properties file to osrm-extract ouput.
+     - Enables the use of multiple segment-speed-files on the osrm-contract command line
+
+   - Profile changes:
+     - Remove movable bridge mode
+     - Add `maxspeed=none` tag to car profile.
+     - A `side_road` tag support for the OSRM car profile.
+
+   - Fixes:
+     - Issue #2150: Prevents routing over delivery ways and nodes
+     - Issue #1972: Provide uninstall target
+     - Issue #2072: Disable alternatives by default and if core factor < 1.0
+     - Issue #1999: Fix unpacking for self-loop nodes not in core.
+
+   - Infrastructure:
+     - Cucumber test suit is now based on cucumber-js, removes Ruby as dependency
+     - Updated to mapbox/variant v1.1
+     - Updated to libosmium v2.6.1
+     - Remove GeoJSON based debugging output, replaced by debug tiles
+
+
 # 5.0.0 RC2
    - Profiles:
       - `properties.allow_uturns_at_via` -> `properties.continue_straight_at_waypoint` (value is inverted!)