[xen stable-4.18] README: make heading say 4.18

[patchbot@xxxxxxx]

commit a4092dca80828c56d3ca34561ed81471ebb6d120
Author:     Julien Grall <jgrall@xxxxxxxxxx>
AuthorDate: Wed Nov 15 12:11:27 2023 +0000
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Wed Nov 15 12:11:27 2023 +0000

    README: make heading say 4.18
    
    Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 README | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/README b/README
index 855db01d36..1a4de51844 100644
--- a/README
+++ b/README
@@ -1,11 +1,11 @@
-#################################################
+##################################
 __  __            _  _    _  ___
-\ \/ /___ _ __   | || |  / |( _ )       _ __ ___
- \  // _ \ '_ \  | || |_ | |/ _ \ _____| '__/ __|
- /  \  __/ | | | |__   _|| | (_) |_____| | | (__
-/_/\_\___|_| |_|    |_|(_)_|\___/      |_|  \___|
+\ \/ /___ _ __   | || |  / |( _ )
+ \  // _ \ '_ \  | || |_ | |/ _ \
+ /  \  __/ | | | |__   _|| | (_) |
+/_/\_\___|_| |_|    |_|(_)_|\___/
 
-#################################################
+##################################
 
 https://www.xen.org/
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.18