Set last CHANGELOG as unreleased

Signed-off-by: William Desportes <williamdes@wdes.fr>

Author: williamdes

CHANGELOG.md

@@ -1,12 +1,15 @@
 # Change Log
 
+## [Unreleased] -
+
+* Fix ALTER TABLE ... PRIMARY/UNIQUE KEY results in error (#267)
+
 ## [4.4.0] - 2019-11-12
 
 * Fix for PHP deprecations messages about implode for php 7.4+ (#258)
 * Parse CHECK keyword on table definition (#264)
 * Parse truncate statement (#221)
 * Fix wrong parsing of partitions (#265)
-* Fix ALTER TABLE ... PRIMARY/UNIQUE KEY results in error (#267)
 
 ## [4.3.2] - 2019-06-03