fix issues

contracts/migration.go

@@ -8,3 +8,5 @@ type Migration interface {
 	Up(tx *gorm.DB) error
 	Down(tx *gorm.DB) error
 }
+
+type MigrationProvider func() Migration

contracts/seeder.go

@@ -9,3 +9,5 @@ import (
 type Seeder interface {
 	Run(*gofakeit.Faker, *gorm.DB)
 }
+
+type SeederProvider func() Seeder