README: Add missing Switch mention, update notes on macOS

README.md

@@ -76,10 +76,11 @@ Supported Platforms
 -------------------
 
 - Windows Vista or newer
-- OS X 10.7 (Lion)[<sup>[3]</sup>](#osxver) or newer
+- OS X 10.8 (Mountain Lion)[<sup>[3]</sup>](#osxver) or newer
 - Linux
 - FreeBSD
 - Nintendo 3DS
+- Nintendo Switch
 - Wii
 - PlayStation Vita
 
@@ -238,7 +239,7 @@ Footnotes
 
 <a name="flashdetect">[2]</a> Flash memory size detection does not work in some cases. These can be configured at runtime, but filing a bug is recommended if such a case is encountered.
 
-<a name="osxver">[3]</a> 10.7 is only needed for the Qt port. The SDL port is known to work on 10.5, and may work on older.
+<a name="osxver">[3]</a> 10.8 is only needed for the Qt port. It may be possible to build or running the Qt port on 10.7 or older, but this is not officially supported. The SDL port is known to work on 10.5, and may work on older.
 
 [downloads]: http://mgba.io/downloads.html
 [source]: https://github.com/mgba-emu/mgba/