Correctly await things.

README.md

@@ -34,7 +34,7 @@ const migrations: Array<Migration<string>> = [
 ];
 
 // Migrate your data.
-const migrated = migrate(data, version, migrations);
+const migrated = await migrate(data, version, migrations);
 
 // Congratulations, your data is now on version 1.0.2!
 console.log(migrated);

package.json

@@ -53,6 +53,9 @@
   },
   "xo": {
     "prettier": true,
+    "rules": {
+      "no-await-in-loop": "off"
+    },
     "space": true
   }
 }

source/migration-helper.ts

@@ -44,7 +44,7 @@ export async function migrate<V>(
       continue;
     }
 
-    migratedData = migration.migrate(migratedData);
+    migratedData = await migration.migrate(migratedData);
   }
 
   return migratedData;