Update changelog

CHANGELOG.md

@@ -2,13 +2,25 @@
 
 ## [Unreleased]
 
-## [4.6.1] - 2022-01-29
-Unless a major bug is found, this will be the last release in the v4.x series. All future releases will be v5.x.
+## [4.7.0] - 2022-06-26
+The v4.x series is receiving basic maintenance only. All feature development takes place in v5.x.
 This is because one of PHP8.1's [new deprecations](https://github.com/php/php-src/commit/afc4d67c8b4e02a985a4cd27b8e79b343eb3c0ad)
-requires a significant non-backwards compatible change to address.
+required a significant non-backwards compatible change to address.
+
+### Added
+ - Support for defining 3D projected coordinates
+
+### Fixed
+ - Improved handling of longitudes greater than 180 degrees
+ - Corrected conversion of geocentric coordinates to geographic coordinates when using a non-Greenwich prime meridian
+
+### Changed
+ - Updates to data for ITRF, WGS84, Australia, Belgium, Canada, France, Germany, Iceland, Ireland, Japan, Luxembourg, Norway, North Macedonia, UK and USA
+
+## [4.6.1] - 2022-01-29
 
 ### Fixed
-- Guard against divide by zero issues when calculating distance between two points
+ - Guard against divide by zero issues when calculating distance between two points
 
 ## [4.6.0] - 2021-10-22
 ### Changed