State actual code coverage facts [skip ci]

Author: thekid

ChangeLog.md

@@ -12,7 +12,8 @@ XP Compiler ChangeLog
 * Removed conditional checks for PHP 8.1 with native enum support, all
   releases and builds available on CI systems now contain it.
   (@thekid)
-* Increased test coverage significantly, especially of the compiler CLI
+* Increased test coverage significantly (to more than 90%), especially
+  for classes used by the compiler command line.
   (@thekid)
 
 ## 6.5.0 / 2021-05-22