chore: add deprecation notice (#50)

* chore: add deprecation notice * chore: specify release associated with the deprecation
libp2p · Jun 12, 2020 · 2a9b99c · 2a9b99c
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+⛔️ DEPRECATED: libp2p-keychain is now in [libp2p/src/keychain](https://github.com/libp2p/js-libp2p/tree/master/src/keychain) per [libp2p@0.28.0](https://github.com/libp2p/js-libp2p/releases/tag/v0.28.0).
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 # js-libp2p-keychain
 
 [![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://protocol.ai)