Update github branch in config.

Author: gkellogg

index.html

@@ -28,7 +28,10 @@
       previousMaturity:     "PR",
       prevRecURI:            "https://www.w3.org/TR/2014/REC-json-ld-20140116/",
       errata:               "https://w3c.github.io/json-ld-syntax/errata/",
-      github:               "https://github.com/w3c/json-ld-syntax/",
+      github: {
+        repoURL: "https://github.com/w3c/json-ld-syntax/",
+        branch: "main"
+      },
 
       // if there a publicly available Editor's Draft, this is the link
       edDraftURI:             "https://w3c.github.io/json-ld-syntax/",