#1216 respond to CocDiagnosticChange (#1243)

Author: alex-courtis

lua/nvim-tree/diagnostics.lua

@@ -171,6 +171,7 @@ function M.setup(opts)
   if M.enable then
     log.line("diagnostics", "setup")
     vim.cmd "au DiagnosticChanged * lua require'nvim-tree.diagnostics'.update()"
+    vim.cmd "au User CocDiagnosticChange lua require'nvim-tree.diagnostics'.update()"
   end
 end