fix action indentation

Author: Amelia Wattenbeger

action.yml

@@ -6,9 +6,9 @@ inputs:
     description: "A path (relative to the root of your repo) to where you would like the diagram to live. For example: images/diagram.svg. Default: diagram.svg"
     required: false
 outputs:
-runs:
-  using: "node12"
-  main: "index.js"
-branding:
-  color: "purple"
-  icon: "download-cloud"
+  runs:
+    using: "node12"
+    main: "index.js"
+  branding:
+    color: "purple"
+    icon: "download-cloud"