Update Dependabot config file (#78)

Author: dependabot-preview[bot]

.dependabot/config.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+- package-ecosystem: nuget
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "03:00"
+  open-pull-requests-limit: 99