Add CHANGELOG entry for #267

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

Author: williamdes

CHANGELOG.md

@@ -6,6 +6,7 @@
 * 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