Rewrite itctl to use urfave/cli instead of spf13/cobra

cmd/itctl/notify.go

@@ -0,0 +1,17 @@
+package main
+
+import "github.com/urfave/cli/v2"
+
+func notify(c *cli.Context) error {
+	// Ensure required arguments
+	if c.Args().Len() != 2 {
+		return cli.Exit("Command notify requires two arguments", 1)
+	}
+
+	err := client.Notify(c.Args().Get(0), c.Args().Get(1))
+	if err != nil {
+		return err
+	}
+
+	return nil
+}