Fix wrong config key in README

README.md

@@ -48,7 +48,7 @@ path = "error"
 action = "echo '{{$.books.*.title}}'"
 # Validate secrets according to different parsing rules
 # Currently only GitHub secrets are supported
-secret = { value = "my secret", type = "GitHub"}
+secret = { value = "my secret", format = "GitHub"}
 
 [endpoints.testscript]
 path = "script"
@@ -67,4 +67,4 @@ will also be provided in the environment variable `HOOK_BODY`.
 
 ## License
 
-GPL-3
+GPL-3