Version v0.5.1: bugfixes of fatal errors

Version v0.5.0: supports full features set of swindon 0.7.0, adds act…

…ivity tracking, better error handling

Version v0.4.1: fixes bug of resubscribing to a lattice on reconnect

Version v0.4.0: adds lattices API, adds `unsupported` status

Version v0.3.3: adds callback for `Guard.init` and `Guard.deinit`

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Version v0.3.2: finally gets sane reconnect mechanics

Version v0.3.1: fixes few reconnect issues

Version v0.3.0: uses subprotocol `v1.swindon-lattice+json`

Version v0.2.0: fully reworked API