Fix typo

Author: meister

repos.sexp

@@ -194,7 +194,7 @@
  (:name :cando
   :repository "https://github.com/cando-developers/cando.git"
   :directory "extensions/cando/"
-  :branch "repl"
+  :branch "main"
   :extension :cando)
  (:name :seqan-clasp
   :repository "https://github.com/clasp-developers/seqan-clasp.git"