open dependabot against dev branch. gitattributes had the wrong extension type

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+ - package-ecosystem: "npm"
+   target-branch: "dev"
+   directory: "/"
+   schedule:
+    interval: "weekly"
+    day: "sunday"