Fix up paths for README

Thank you to rust-lang/cargo#11645 (comment) for explaining how to do this. ❤️❤️

Author: scouten

parser/Cargo.toml

@@ -6,7 +6,7 @@ authors = ["Eric Scouten <[email protected]>"]
 license = "MIT OR Apache-2.0"
 documentation = "https://docs.rs/asciidoc-parser"
 repository = "https://github.com/scouten/asciidoc-parser"
-readme = "README.md"
+readme = "../README.md"
 edition = "2021"
 keywords = ["asciidoc", "parser"]
 categories = ["parser-implementations"]

parser/src/lib.rs

@@ -4,7 +4,7 @@
 #![deny(clippy::unwrap_used)]
 #![deny(missing_docs)]
 #![deny(warnings)]
-#![doc = include_str!("../../README.md")]
+#![doc = include_str!(concat!("../", std::env!("CARGO_PKG_README")))]
 
 pub mod attributes;