Multiversion 0.5.0

Added

• Support for associated functions (including methods).
• Support for impl Trait.
• Specification for name mangling.
• Documentation for #[safe_inner] helper attribute for #[target].

Removed

• Removed #[target_clones] attribute (functionality is now included in #[multiversion] attribute).

Changed

• #[multiversion] interface now uses helper attributes, providing both target specialization and function cloning.
• Increased minimum required Rust version to 1.34.0.

Fixed

• Vague error spans now point to a more informative source location.
• All errors now produce compile_error! instead of macro panics.