Release notes for 2.4.2.

Release Notes/Release Notes v2.4.2.md

@@ -1,3 +1,29 @@
 # .NET Driver Version 2.4.2 Release Notes
 
-This is a placeholder file for the 2.4.2 release notes.
+This is a patch release that fixes a few bugs reported since 2.4.1 was released.
+
+The main change is adding back support for using a <TField> which is not the same as the actual
+field type in filter builder methods and the Distinct method. Normally <TField> is expected to
+match the actual field type, but it turns out there are cases where one might want to specify
+a type for <TField> that does not match the field type exactly. See the following tickets for
+more information about these changes
+
+https://jira.mongodb.org/browse/CSHARP-1884
+https://jira.mongodb.org/browse/CSHARP-1890
+https://jira.mongodb.org/browse/CSHARP-1891
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.4.2.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%202.4.2%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.