add handlers, storage(Postgres, sqlite) (#3)

Reviewed-on: #3
Co-authored-by: Evstigneev Denis <danteevstigneev@yandex.ru>
Co-committed-by: Evstigneev Denis <danteevstigneev@yandex.ru>

internal/modproxy.go

@@ -282,7 +282,7 @@ func Updates(opt UpdateOptions) {
 				return nil
 			})
 		}
-		group.Wait()
+		_ = group.Wait()
 	}()
 	for u := range ch {
 		if opt.OnUpdate != nil {