How to publish multi-module addon to directory?

Hello.

I develop server-side addon - https://vaadin.com/directory#!addon/subnavigator. Addon consists of two projects - API and implementation. After publishing zip to directory only one jar is available from vaadin maven repo - implementation, API jar is not available.

My MANIFEST.MF:

Manifest-Version: 1.0
Vaadin-Package-Version: 1
Vaadin-Addon: sub-navigator-1.0.1.jar
Vaadin-Dependency: sub-navigator-api-1.0.1.jar
Vaadin-License-Title: Apache License 2.0
Implementation-Vendor: com.indvd00m.vaadin
Implementation-Title: SubNavigator
Implementation-Version: 1.0.1

Zip-file content:

.
├── LICENSE.txt
├── META-INF
│   └── MANIFEST.MF
├── README.md
├── src
│   ├── sub-navigator-1.0.1-sources.jar
│   └── sub-navigator-api-1.0.1-sources.jar
├── sub-navigator-1.0.1.jar
└── sub-navigator-api-1.0.1.jar

Artifact sub-navigator-api is not available from vaadin repository. After trying build some project with this addon maven throw an exception:

Could not find artifact com.indvd00m.vaadin:sub-navigator-api:jar:1.0.1 in vaadin-addons (http://maven.vaadin.com/vaadin-addons)

Addon source code:
https://github.com/indvd00m/vaadin-sub-navigator

How can I fix this?