v0.8.0

Adds support for handling SmartStart meta extension fields.

These fields give more information about the current status, inclusion methods,
and product information for the SmartStart device.

There are two breaking changes:

1. All SmartStart meta extensions were moved from Grizzly.CommandClass.NodeProvisioning
   namespace into the Grizzly.SmartStart.MetaExtension namespace.
2. Upon finalizing the meta extension behaviour and API we made changes to how
   previously supported meta extensions worked. Namely, we added a new/1
   callback that does parameter validation, and returns {:ok, MetaExtension.t()}.
   This breaks the previous behaviour of to_binary/1 functions in previously
   implemented meta extensions.

• Enhancements
  • Full support for SmartStart meta extensions
  • Add meta_extensions field to Grizzly.CommandClass.NodeProvisioning
    commands that can handle meta extensions
  • Update Grizzly.Conn.Server.Config docs
• Fixes
  • Invalid keep alive (heart beat) interval
  • Set correct constraints on Time command offset values

Thank you to those who contributed to this release:

• Jean-Francois Cloutier
• Ryan Winchester