Allow compact arrays

[wyardley]

Is there a flag to be less strict about compact arrays?

I'd like to have a diff for things like fixes for incorrect trailing commas, etc, but not for these other sorts of concerns.

I'm not sure if --no-pretty-print or --no-sort-keys are valid (the program doesn't error, but doesn't seem to behave differently

-      "matchDepTypes": ["dev", "devDependencies"],
-      "addLabels": ["dev-dependencies"]
+      "matchDepTypes": [
+        "dev",
+        "devDependencies"
+      ],
+      "addLabels": [
+        "dev-dependencies"
+      ]