CHANGELOG.md in ruby-vips-2.0.12 vs CHANGELOG.md in ruby-vips-2.0.13

@@ -1,8 +1,13 @@
 # Changelog
 
 ## master
 
+## Version 2.0.13 (2018-8-6)
+
+* allow optional args to have `nil` as a value [janko-m]
+* fix five small memleaks [kleisauke]
+
 ## Version 2.0.12 (2018-4-25)
 
 * fix `Vips::Image#has_alpha?` with older libvips [larskanis]
 
 ## Version 2.0.11 (2018-4-23)