Use semantic-release for releasing

[vogdb]

Not yet ready to merge.

@wemeetagain please advice what else should I add for semantic-release. Perhaps there is a good example of existing project that you might recommend.

[wemeetagain]

Take a look at the configuration in the package.json here https://github.com/libp2p/js-libp2p-tcp

[vogdb]

I see that libp2p/js-libp2p-tcp#155 adds only "release" key to package.json. Besides that I've replaced:

    "release": "aegir release --target node --target browser",
    "release-minor": "aegir release --type minor --target node --target browser",
    "release-major": "aegir release --type major --target node --target browser",

with

    "release": "semantic-release",

Please verify. I feel that I could have easily missed something.

[vogdb]

Closing in favor of #151