Release notes for 2.4.3.

Author: rstam

Release Notes/Release Notes v2.4.3.md

@@ -1,3 +1,24 @@
-# .NET Driver Version 2.4.23 Release Notes
+# .NET Driver Version 2.4.3 Release Notes
 
-This file is a placeholder.
+This is a patch release that fixes a few bugs reported since 2.4.2 was released.
+
+Most of the changes are minor, but if you use X509 certificates with SSL you should
+definitely upgrade to 2.4.3. See:
+
+https://jira.mongodb.org/browse/CSHARP-1914
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.4.3.md
+
+The full list of JIRA issues resolved in this release is available at:
+
+https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%202.4.3%20ORDER%20BY%20key%20ASC
+
+Documentation on the .NET driver can be found at:
+
+http://mongodb.github.io/mongo-csharp-driver/
+
+Upgrading
+
+There are no known backwards breaking changes in this release.