Update polaris-migrator/README.md

Co-authored-by: Aaron Casanova <32409546+aaronccasanova@users.noreply.github.com>

Author: sam-b-rose

polaris-migrator/README.md

@@ -369,4 +369,3 @@ git reset $(grep -r -l "polaris-migrator:")
 - Common utilities:
   - [`jsx.ts`](https://github.com/Shopify/polaris/blob/main/polaris-migrator/src/utilities/jsx.ts)
   - [`imports.ts`](https://github.com/Shopify/polaris/blob/main/polaris-migrator/src/utilities/imports.ts)
-    0