rkyv_impl 0.3.0

Macro for `rkyv` users to implement methods on `Foo` and `ArchivedFoo` in a single `impl` block.
Documentation 
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error: custom attribute panicked
 --> test_files/unexpected-input.rs:7:1
  |
7 | #[archive_impl(blah)]
  | ^^^^^^^^^^^^^^^^^^^^^
  |
  = help: message: Unsupported argument `blah`