Update changelog for 2.7.3

Add 2.7.3 changelog

changelog.txt

@@ -1,5 +1,18 @@
 == SportsPress Changelog ==
 
+= 2.7.3 =
+* Compatibility – Tested for compatibility with WordPress 5.5 with changes made where necessary.
+* Tweak – Avoid showing minutes box for subs when not needed.
+* Tweak – Improve filtering speed for queries without leagues or seasons.
+* Tweak – Apply reverse order setting in event lists.
+* Tweak – Enable filtering a player’s events played on a specific team.
+* Fix – Include future events in REST API for WordPress 5.5.
+* Fix – Enable updating player metrics using the REST API.
+* Fix – Deprecated code for PHP 7.4.
+* Fix – Elementor compatibility.
+* Localization – Update country names for Czechia, North Macedonia, Myanmar, and Eswatini.
+* Localization – Adjust RTL stylesheet for event performance icons.
+
 = 2.7.2 =
 * Tweak - Sanitize delimiter field in event settings.