Upgrade to GitHub-native Dependabot

Author: dependabot-preview[bot]

.dependabot/config.yml

@@ -0,0 +1,15 @@
+version: 2
+updates:
+- package-ecosystem: composer
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "11:00"
+  open-pull-requests-limit: 99
+  target-branch: master
+  labels:
+  - dependencies
+  - dependabot
+  versioning-strategy: increase
+  allow:
+  - dependency-name: dreamfactory/df*