Add update to CHANGELOG.md

Signed-off-by: Mehdy Khoshnoody <mehdy.khoshnoody@gmail.com>

Author: mehdy

CHANGELOG.md

@@ -15,6 +15,7 @@ any parts of the framework not mentioned in the documentation should generally b
 * Adjusted error messages to correctly use capital "JSON:API" abbreviation as used in the specification.
 * Avoid error when `parser_context` is `None` while parsing.
 * Raise comprehensible error when reserved field names `meta` and `results` are used.
+* Use `relationships` in the error object `pointer` when the field is actually a relationship.
 
 ### Changed