Prepare 9.0.0

Author: thekid

ChangeLog.md

@@ -3,6 +3,13 @@ XP Math changelog
 
 ## ?.?.? / ????-??-??
 
+## 9.0.0 / 2020-04-10
+
+* Implemented xp-framework/rfc#334: Drop PHP 5.6:
+  . **Heads up:** Minimum required PHP version now is PHP 7.0.0
+  . Rewrote code base, grouping use statements
+  (@thekid)
+
 ## 8.0.1 / 2019-12-01
 
 * Made compatible with XP 10 - @thekid