Always set sy.updated_by

References #235.

autoload/sy/sign.vim

@@ -196,10 +196,10 @@ function! sy#sign#process_diff(sy, vcs, diff) abort
   endif
 
   call sy#verbose('Signs updated.', a:vcs)
+  let a:sy.updated_by = a:vcs
   if len(a:sy.vcs) > 1
     call sy#verbose('Disable all other VCS.', a:vcs)
     let a:sy.vcs = [a:vcs]
-    let a:sy.updated_by = a:vcs
   endif
 
   let a:sy.stats = [added, modified, deleted]