Release v0.7.0

[ascjones]

This PR reverts #102 for this release, which will be restored in a follow up 0.8.0-rc.0 release.

Added

• Handle more SCALE attributes: skip, index (#44)
• Implement TypeInfo for BTreeSet (#85)
• Implement TypeInfo for Cow (#84)
• Implement TypeInfo for up to 20 element tuples (#92)
• Add StaticTypeInfo convenience trait (#91)
• Capture doc comments, add variant and field builders (#87)
• Handle #[codec(index = …)] in regular enums (#80)
• Add new top-level attribute scale_info(bounds(T: SomeTrait + OtherTrait)) (#88)
• (aj-vecdeque) Implement TypeInfo for VecDeque (#99)
• Add BitVec support (#98)
• Add docs feature (#101)

Changed

• Upgrade proc-macro-crate to v1 (#77)
• Use const generics for array TypeInfo impls (#54)
• Replace NonZeroU32 type lookup ids with u32 (#90)
• Remove HasCompact::Type bounds (#83)
• Unify sequence types (#100)

Fixed

• Fix serde and decode features without default features (#74)
• Remove type parameter defaults (#71)
• Fix trait bounds for associated types (#76)