readme mention record

Author: seruman

README.md

@@ -49,6 +49,7 @@ starts automatically on the first command if not already running.
     --rows, -r <rows>       Terminal height (default: 24)
     --cwd, -d <path>        Working directory
     --env <KEY=VALUE>       Set environment variable (repeatable)
+    --record <path>         Record session to asciicast v2 file (.cast)
 
 Session names must match `[a-zA-Z0-9_-]{1,64}`.
 If no shell is given, the default login shell is used.
@@ -57,8 +58,13 @@ If no shell is given, the default login shell is used.
 bootty spawn --name dev bash
 bootty spawn --cols 120 --rows 40 /bin/sh -c "make && ./run"
 bootty spawn --env EDITOR=vim --env LANG=en_US.UTF-8
+bootty spawn --record /tmp/session.cast bash
 ```
 
+The `--record` flag writes all PTY output to an
+[asciicast v2](https://docs.asciinema.org/manual/asciicast/v2/) file that
+can be played back with `asciinema play` or embedded in web pages.
+
 ### type
 
 Send raw text to the terminal. Characters are written directly to the PTY.
@@ -114,6 +120,7 @@ Formats: `text` (default), `json`, `html`, `vt`.
 bootty screenshot
 bootty screenshot --format json
 bootty screenshot --format html > output.html
+bootty screenshot --format vt
 ```
 
 ### wait