chore(deps-dev): The driver currently supports 4.2+ servers. (#4563)

Author: WilbertYang

README.md

@@ -72,9 +72,9 @@ Change history can be found in [`HISTORY.md`](https://github.com/mongodb/node-mo
 
 ### Compatibility
 
-The driver currently supports 4.0+ servers.
+The driver currently supports 4.2+ servers.
 
-** 4.0 support is deprecated and support will be removed in an upcoming driver release. **
+** 4.2 support is deprecated and support will be removed in an upcoming driver release. **
 
 For exhaustive server and runtime version compatibility matrices, please refer to the following links: