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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#[test]
fn compile_errors() {
    let t = trybuild::TestCases::new();
    t.compile_fail("test_files/unexpected-input.rs");
    t.compile_fail("test_files/unsupported-self-type.rs");
}