Update dependabot.yml

Author: bradp

.github/dependabot.yml

@@ -1,14 +1,14 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-
 version: 2
 updates:
-  - package-ecosystem: "npm"
-    directory: "/"
+  - package-ecosystem: "npm" # See documentation for possible values
+    directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
-    reviewers: 
+    reviewers:
       - "bradp"
     versioning-strategy: increase
+    groups:
+      dev-dependencies:
+        applies-to: version-updates
+        patterns:
+          - "*"