chore: extend feature list

Author: zookzook

README.md

@@ -28,6 +28,7 @@
 - support for simple structs using the Mongo.Encoder protocol
 - support for complex and nested documents using the `Mongo.Collection` macros
 - support for streaming protocol ([See](https://github.com/mongodb/specifications/blob/master/source/server-discovery-and-monitoring/server-monitoring.rst#streaming-protocol))
+- support for migration scripts
 
 ## Usage