[Photon] Update CHANGELOG.md

Author: jbelien

src/Provider/Photon/CHANGELOG.md

@@ -2,6 +2,13 @@
 
 The change log describes what is "Added", "Removed", "Changed" or "Fixed" between each release.
 
+## 0.8.0
+
+### Added
+
+- Add support for `layer` and `radius` parameters
+- Improve locality extraction
+
 ## 0.7.0
 
 ### Added