fix: store failing validation after schema change

Defer validation until after migrations are applied so that the store can be updated to the current schema.

Migrate store before validating store

source/index.ts

@@ -137,6 +137,15 @@ export default class Conf<T extends Record<string, any> = Record<string, unknown
 
 		const fileStore = this.store;
 		const store = Object.assign(createPlainObject(), options.defaults, fileStore);
+
+		if (options.migrations) {
+			if (!options.projectVersion) {
+				throw new Error('Please specify the `projectVersion` option.');
+			}
+
+			this._migrate(options.migrations, options.projectVersion, options.beforeEachMigration);
+		}
+
 		this._validate(store);
 
 		try {
@@ -149,13 +158,7 @@ export default class Conf<T extends Record<string, any> = Record<string, unknown
 			this._watch();
 		}
 
-		if (options.migrations) {
-			if (!options.projectVersion) {
-				throw new Error('Please specify the `projectVersion` option.');
-			}
-
-			this._migrate(options.migrations, options.projectVersion, options.beforeEachMigration);
-		}
+
 	}
 
 	/**