Update prettier config

Author: emmatown

.prettierrc.js

@@ -1,4 +1,10 @@
 module.exports = {
   singleQuote: true,
   trailingComma: 'es5',
+  overrides: [
+    {
+      files: '.changeset/pre.json',
+      options: { parser: 'json-stringify' },
+    },
+  ],
 };