Add Qt6 version to INSTALL file

Chocobo1 · web-flow · commit 4d541ca969e5 · 2022-01-13T12:39:15.000+08:00
PR qbittorrent#16054.
diff --git a/INSTALL b/INSTALL
@@ -11,7 +11,7 @@ qBittorrent - A BitTorrent client in C++ / Qt
 
   - OpenSSL >= 1.1.1
 
-  - Qt 5.15.2 - 5.x
+  - Qt 5.15.2 - 5.x || 6.2.0 - 6.x
 
   - zlib >= 1.2.11
 
