Dependabot (#403)

* Create dependabot.yml

* Update dependabot.yml

Add Gradle package ecosystem

.github/dependabot.yml

@@ -0,0 +1,18 @@
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: gradle
+    directory: "/"
+    schedule:
+      interval: daily
+    target-branch: "master"
+    open-pull-requests-limit: 0
+
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: daily
+    target-branch: "master"
+    open-pull-requests-limit: 0