Merge pull request #4 from pepabo/use-dependabot

use dependabot for dependency update

Author: kurotaky

Diff for: .github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: 'daily'
+      time: '09:00'
+      timezone: 'Asia/Tokyo'