Remove link to blog post

It's pretty out of date by now

Author: konstin

Readme.md

@@ -485,5 +485,3 @@ There are some optional hacks that can speed up the tests (over 80s to 17s on my
 1. By running `cargo build --release --manifest-path test-crates/cargo-mock/Cargo.toml` you can activate a cargo cache avoiding to rebuild the pyo3 test crates with every python version.
 2. Delete `target/test-cache` to clear the cache (e.g. after changing a test crate) or remove `test-crates/cargo-mock/target/release/cargo` to deactivate it.
 3. By running the tests with the `faster-tests` feature, binaries are stripped and wheels are only stored and not compressed.
-
-You might want to have look into my by now slightly outdated [blog post](https://blog.schuetze.link/2018/07/21/a-dive-into-packaging-native-python-extensions.html) which explains the intricacies of building native python packages.