Rename CLI to asynq

tools/asynq/main.go

@@ -0,0 +1,11 @@
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package main
+
+import "github.com/hibiken/asynq/tools/asynq/cmd"
+
+func main() {
+	cmd.Execute()
+}