Update README.md (fix branch name on fork) (#134)

Author: GioF71

README.md

@@ -6,7 +6,7 @@ A Docker image for [librespot](https://github.com/librespot-org/librespot)
 
 The current `latest` image is built on the current `dev` branch of [librespot](https://github.com/librespot-org/librespot), at [this commit](https://github.com/librespot-org/librespot/commit/ba3d501b08345aadf207d09b3a0713853228ba64).  
 This fixes [this issue](https://github.com/GioF71/librespot-docker/issues/128) even using the `latest` image, without the need to apply the suggested workaround (for that, thanks to [this post on Moode Audio forum](https://moodeaudio.org/forum/showthread.php?tid=7915&pid=65727#pid65727)).  
-I will use [my fork of librespot](https://github.com/GioF71/librespot-docker), purposedly created just to have a tag named `2025-08-11` at the specified commit.  
+I will use [my fork of librespot](https://github.com/GioF71/librespot-docker), purposedly created just to have a tag named `dev-2025-08-11` at the specified commit.  
 
 ## Reference