README.md: update the status of the QEMU patches

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

README.md

@@ -101,7 +101,9 @@ Install recent version of QEMU. v6.1.0 or later is recommended.
 
 On ARM hosts, a [patched](https://patchwork.kernel.org/series/548227/mbox/) version of QEMU has to be installed for enabling `-accel hvf` support.
 
-The patch is not merged into the QEMU upstream yet as of QEMU v6.1.0, but already included in [the Homebrew package of QEMU](https://github.com/Homebrew/homebrew-core/commit/5e8eb547) since `6.1.0_1` bottle.
+The patch was merged into the master branch on [2021-09-21](https://github.com/qemu/qemu/commit/81ceb36b9) and will be included in QEMU v6.2.0.
+
+The patch is already cherry-picked in [the Homebrew package of QEMU](https://github.com/Homebrew/homebrew-core/commit/5e8eb547) since `6.1.0_1` bottle.
 
 #### Install Lima