HACKING.md: use `socat -u` in examples

HACKING.md

@@ -32,31 +32,21 @@ on chat, e.g.  text-to-speech or Twitch Plays Pokémon.
 
 View events like this:
 ```sh
-socat UNIX-CONNECT:event.sock STDOUT
+socat -u UNIX-CONNECT:event.sock STDOUT
 ```
 
-Sidenote, this will still read from stdin, and if you send anything on
-stdin the event socket will close itself.  If you want to ignore stdin,
-I couldn't figure out how to get `socat` to do it so you can do it like
-this:
-```sh
-cat > /dev/null | socat UNIX-CONNECT:event.sock STDOUT
-```
-If you do this `cat` will not exit when the connection is closed so you
-will probably have to interrupt it with `^C`.
-
 #### Examples
 
 If you have `jq` you can view prettified events like this:
 ```sh
-socat UNIX-CONNECT:event.sock STDOUT | jq
+socat -u UNIX-CONNECT:event.sock STDOUT | jq
 ```
 (On older versions of `jq` you have to say `jq .` when reading from
 stdin.)
 
 Use this to get each new chat message on a new line:
 ```sh
-socat UNIX-CONNECT:event.sock STDOUT | jq 'select(.type == "message") | .event.nomarkup'
+socat -u UNIX-CONNECT:event.sock STDOUT | jq 'select(.type == "message") | .event.nomarkup'
 ```
 
 ##### Text-to-speech
@@ -65,7 +55,7 @@ This command will take each new chat message with the prefix "!say ",
 strip the prefix, and synthesize the rest of the message as speech using
 `espeak`:
 ```sh
-socat UNIX-CONNECT:event.sock STDOUT \
+socat -u UNIX-CONNECT:event.sock STDOUT \
 | jq --unbuffered 'select(.type == "message") | .event.nomarkup' \
 | grep -E --line-buffered '^"!say ' \
 | sed -Eu 's/^"!say /"/' \