Add changelog entry

CHANGELOG-1.0.md

@@ -14,6 +14,9 @@ milestone.
  flag to indexes when calling `MongoCollection::getIndexInfo`.
  * [#120](https://github.com/alcaeus/mongo-php-adapter/pull/120) throws the proper
  `MongoWriteConcernException` when encountering bulk write errors.
+ * [#122](https://github.com/alcaeus/mongo-php-adapter/pull/122) fixes an error in
+ `MongoCollection::findAndModify` when specifying both the `update` parameter as
+ well as the `update` option.
 
 1.0.4 (2016-06-22)
 ------------------