migrationsSince method
Migrations after a version
versionNumber
defaults to version
Implementation
List<Migration> migrationsSince([int? versionNumber]) {
final number = versionNumber ?? version;
final validMigrations = migrations.where((m) => m.version > number).toList();
validMigrations.sort((a, b) => a.version.compareTo(b.version));
return validMigrations;
}