Print to stderr instead of normal echo if log message is of type error

lua/dep/log.lua

@@ -43,12 +43,16 @@ function logger:log(op, message)
     end
 
     if not self.silent and colors[op] then
+      if op == "error" then
+        vim.api.nvim_err_writeln(string.format("[dep] %s", message))
+      else
         vim.api.nvim_echo({
           { "[dep]", "Identifier" },
           { " " },
           { message, colors[op] },
         }, true, {})
       end
+    end
 
     if self.pipe then
       self.pipe:write(string.format("[%s] %s: %s\n", os.date(), source, message))