update changelog and upgrade docs

docs/changelog.rst

@@ -4,6 +4,12 @@ Changelog
 
 Development
 ===========
+- (Fill this out as you fix issues and develop you features).
+
+Changes in 0.11.0
+=================
+- BREAKING CHANGE: Renamed `ConnectionError` to `MongoEngineConnectionError` since the former is a built-in exception name in Python v3.x. #1428
+- BREAKING CHANGE: Dropped Python 2.6 support. #1428
 - Fixed absent rounding for DecimalField when `force_string` is set. #1103
 
 Changes in 0.10.8

docs/upgrade.rst

@@ -2,6 +2,26 @@
 Upgrading
 #########
 
+0.11.0
+******
+This release includes a major rehaul of MongoEngine's code quality and
+introduces a couple breaking changes. It also touches many different parts of
+the package and although all the changes have been tested and scrutinized,
+you're encouraged to thorougly test the upgrade.
+
+First breaking change involves renaming `ConnectionError` to `MongoEngineConnectionError`.
+If you import or catch this exception, you'll need to rename it in your code.
+
+Second breaking change drops Python v2.6 support. If you run MongoEngine on
+that Python version, you'll need to upgrade it first.
+
+0.10.8
+******
+This version fixed an issue where specifying a MongoDB URI host would override
+more information than it should. These changes are minor, but they still
+subtly modify the connection logic and thus you're encouraged to test your
+MongoDB connection before shipping v0.10.8 in production.
+
 0.10.7
 ******