Update changelog for getPreferredLocales and localechanged.

changes.txt

@@ -42,6 +42,8 @@ Released: N/A
 * Added a variant of love.graphics.setColorMask which accepts a single boolean.
 * Added new 'clampone' wrap mode.
 * Added a variant of Font:getWidth which takes a codepoint number argument.
+* Added love.system.getPreferredLocales.
+* Added love.localechanged callback.
 
 * Changed the default font from Vera size 12 to Noto Sans size 13.
 * Changed the Texture class and implementation to no longer have separate Canvas and Image subclasses.