Merge pull request #2091 from bagerard/release_0_18_1

Bump version number and update changelog for 0.18.1

Author: bagerard

docs/changelog.rst

@@ -5,9 +5,14 @@ Changelog
 
 Development
 ===========
-- Add Python 3.7 in travis #2058
 - (Fill this out as you fix issues and develop your features).
 
+Changes in 0.18.1
+=================
+- Fix a bug introduced in 0.18.0 which was causing `.save()` to update all the fields
+    instead of updating only the modified fields. This bug only occurs when using custom pk #2082
+- Add Python 3.7 in travis #2058
+
 Changes in 0.18.0
 =================
 - Drop support for EOL'd MongoDB v2.6, v3.0, and v3.2.

mongoengine/__init__.py

@@ -23,7 +23,7 @@
            list(signals.__all__) + list(errors.__all__))
 
 
-VERSION = (0, 18, 0)
+VERSION = (0, 18, 1)
 
 
 def get_version():