Update CHANGELOG.md

Release 0.4.0 (WhichBrowser#34)

* Add Chrome 70, 71 and 72

* Version 0.4.0

0.3.5 release (WhichBrowser#28)

* Add new iPhones XS, XS Max, XR

* Releasing 0.3.5

Changed release date

Release 0.3.3 (WhichBrowser#26)

* Wasn't impossible to disable bot detection. Fixed

* Update Changelog and version number

Fix release date of 0.3.2

0.3.1 (WhichBrowser#21)

* Models, indices and profiles update

* Increase version number to 0.3.1

Release of 0.3.0 (WhichBrowser#20)

* Added Chrome 66 & 67

* Release of 0.3.0

Bump up version number

Changelog for 0.2.8