Update CHANGELOG.md

Author: photonstorm

CHANGELOG.md

@@ -23,6 +23,8 @@
 * The Scale Manager would throw the error 'TypeError: this.removeFullscreenTarget is not a function' when entering full-screen mode. It would still enter fullscreen, but the error would appear in the console. Fix #4605 (thanks @darklightcode)
 * `Tilemap.renderDebug` was calling out-dated Graphics API methods, which would cause the debug to fail (thanks @Fabadiculous)
 * The `Matter.Factory.constraint`, `joint` and `worldConstraint` methods wouldn't allow a zero length constraint to be created due to a falsey check of the length argument. You can now set length to be any value, including zero, or leave it undefined to have it automatically calculated (thanks @olilanz)
+* `Pointer.getDuration` would return a negative / static value on desktop, or NaN on mobile, because the base time wasn't being pulled in from the Input Manager properly. Fix #4612 (thanks @BobtheUltimateProgrammer)
+* `Pointer.downTime`, `Pointer.upTime` and `Pointer.moveTime` would be set to NaN on mobile browsers where Touch.timeStamp didn't exist. Fix #4612 (thanks @BobtheUltimateProgrammer)
 
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