Merge pull request #2860 from bagerard/update_changelog_for_clear

update changelog with list .clear change

Author: bagerard

docs/changelog.rst

@@ -16,6 +16,8 @@ Development
 - Further to the deprecation warning, remove `full_response` from `QuerySet.modify` as it wasn't supported with Pymongo 3+
 - Fixed stacklevel of many warnings (to point places emitting the warning more accurately)
 - Add support for collation/hint/comment to delete/update and aggregate #2842
+- BREAKING CHANGE: Remove LongField as it's equivalent to IntField since we drop support to Python2 long time ago (User should simply switch to IntField) #2309
+- BugFix - Calling .clear on a ListField wasn't being marked as changed (and flushed to db upon .save()) #2858
 
 Changes in 0.29.0
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