Renamed migration struct to avoid conflicts

pkg/migration/20190324205606.go

@@ -22,11 +22,11 @@ import (
 )
 
 // Used for rollback
-type tasksReminderDate struct {
+type tasksReminderDateMigration20190324205606 struct {
 	ReminderUnix int64 `xorm:"int(11) INDEX"`
 }
 
-func (tasksReminderDate) TableName() string {
+func (tasksReminderDateMigration20190324205606) TableName() string {
 	return "tasks"
 }
 
@@ -38,7 +38,7 @@ func init() {
 			return dropTableColum(tx, "tasks", "reminder_unix")
 		},
 		Rollback: func(tx *xorm.Engine) error {
-			return tx.Sync2(tasksReminderDate{})
+			return tx.Sync2(tasksReminderDateMigration20190324205606{})
 		},
 	})
 }