doc: update README with existing config options

Author: vjt

README.md

@@ -137,15 +137,17 @@ debug           = true
 test-pages      = true
 ```
 
-Setting         | Description
-:---------------| :-----------------------------------------------------------------------------
-listen          | The listen address (see below)
-clamd-url       | The URL of the clamd server
-application-url | (Optional) Forward all requests to this application
-log-file        | (Optional) The clammit log file, if ommitted will log to stdout
-test-pages      | (Optional) If true, clammit will also offer up a page to perform test uploads
-debug           | (Optional) If true, more things will be logged
-debug-clam      | (Optional) If true, the response from ClamAV will be logged
+Setting                  | Description
+:------------------------| :-----------------------------------------------------------------------------
+listen                   | The listen address (see below)
+unix-socket-perms        | The file mode of the UNIX socket, if listening on one
+clamd-url                | The URL of the clamd server
+virus-status-code        | (Optional) The HTTP status code to return when a virus is found. Default 418
+application-url          | (Optional) Forward all requests to this application
+content-memory-threshold | (Optional) Maximum payload size to keep in RAM. Larger files are spooled to disk
+log-file                 | (Optional) The clammit log file, if ommitted will log to stdout
+test-pages               | (Optional) If true, clammit will also offer up a page to perform test uploads
+debug                    | (Optional) If true, more things will be logged
 
 The listen address can be a TCP port or Unix socket, e.g.: