docs: Fix README.md location

Author: Stranger6667

css-inline/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.6.1"
 authors = ["Dmitry Dygalo <[email protected]>"]
 edition = "2018"
 license = "MIT"
-readme = "README.md"
+readme = "../README.md"
 description = "A crate for inlining CSS into HTML documents"
 repository = "https://github.com/Stranger6667/css-inline"
 keywords = ["html", "css", "css-inline"]