bump version and cleanup migration tool for previous version (#19)

cmd/migration-tool/migration_dummy.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	interfaces "github.com/IceWhaleTech/CasaOS-Common"
+)
+
+type migrationTool struct{}
+
+func (u *migrationTool) IsMigrationNeeded() (bool, error) {
+	return false, nil
+}
+
+func (u *migrationTool) PreMigrate() error {
+	return nil
+}
+
+func (u *migrationTool) Migrate() error {
+	return nil
+}
+
+func (u *migrationTool) PostMigrate() error {
+	return nil
+}
+
+func NewMigrationDummy() interfaces.MigrationTool {
+	return &migrationTool{}
+}