README: add a couple links to the heading

README.md

@@ -15,11 +15,15 @@ $ tar cvz ~/data | age -r age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9
 $ age --decrypt -i key.txt data.tar.gz.age > data.tar.gz
 ```
 
-The format specification is at [age-encryption.org/v1](https://age-encryption.org/v1). age was designed by [@Benjojo12](https://twitter.com/Benjojo12) and [@FiloSottile](https://twitter.com/FiloSottile).
+📜 The format specification is at [age-encryption.org/v1](https://age-encryption.org/v1). age was designed by [@Benjojo12](https://twitter.com/Benjojo12) and [@FiloSottile](https://twitter.com/FiloSottile).
 
-An alternative interoperable Rust implementation is available at [github.com/str4d/rage](https://github.com/str4d/rage).
+📬 Follow the maintenance of this project by subscribing to [Maintainer Dispatches](https://filippo.io/newsletter)!
 
-The author pronounces it `[aɡe̞]`, like the Italian [“aghe”](https://translate.google.com/?sl=it&text=aghe).
+🦀 An alternative interoperable Rust implementation is available at [github.com/str4d/rage](https://github.com/str4d/rage).
+
+🔑 Hardware PIV tokens such as YubiKeys are supported through the [age-plugin-yubikey](https://github.com/str4d/age-plugin-yubikey) plugin.
+
+💬 The author pronounces it `[aɡe̞]`, like the Italian [“aghe”](https://translate.google.com/?sl=it&text=aghe).
 
 ## Installation