Changes since 2.0.0:

• Add DeserializeDict & SerializeDict derive macros for easy handling of "a{sv}"
  type, that is very common in D-Bus and GVariant land.
• Add the awesome zbus logo to docs. :)

Changes since 2.0.1:

• Add to_owned method to string types. This is different than already
  blanked implemented ToOwned trait, as it creates a clone with 'static
  lifetime.
• Deprecate Basic::ALIGNMENT for new alignment() function.
• Implement some conversions:
  • From<&String> for Str
  • From<&String> for Value
  • From<&Vec> for Value
• Fix infinite recursion in Error's PartialEq implementation.