Change to GH style warning in README.md (#43)

README.md

@@ -35,13 +35,14 @@ Format of the `mapping.json` file:
 }
 ```
 
-⚠️**Warning**: Be careful when adding new surrogate scripts to the `mapping.json`
-              file. The block lists are regenerated using the version of
-              `mapping.json` pushed to main (not the version most recently
-              released). From there, redirection rules are automatically added,
-              sometimes even for requests that have specific exceptions. If the
-              surrogate script in question is not yet available on a given
-              platform, the corresponding requests might start being blocked!⚠️
+> [!WARNING]
+> Be careful when adding new surrogate scripts to the `mapping.json`
+> file. The block lists are regenerated using the version of
+> `mapping.json` pushed to main (not the version most recently
+> released). From there, redirection rules are automatically added,
+> sometimes even for requests that have specific exceptions. If the
+> surrogate script in question is not yet available on a given
+> platform, the corresponding requests might start being blocked!
 
 ## Contributing