Merge pull request #2447 from bagerard/_changelog_0_22_0

prepare 0.22.0

Author: bagerard

docs/changelog.rst

@@ -6,8 +6,12 @@ Changelog
 Development
 ===========
 - (Fill this out as you fix issues and develop your features).
+
+Changes in 0.22.0
+=================
 - Fix LazyReferenceField dereferencing in embedded documents #2426
 - Fix regarding the recent use of Cursor.__spec in .count() that was interfering with mongomock #2425
+- Drop support for Python 3.5 by introducing f-strings in the codebase
 
 Changes in 0.21.0
 =================

mongoengine/__init__.py

@@ -28,7 +28,7 @@
 )
 
 
-VERSION = (0, 21, 0)
+VERSION = (0, 22, 0)
 
 
 def get_version():