docs: add remove-on-error option

Signed-off-by: Dwi Siswanto <[email protected]>

README.md

@@ -142,7 +142,8 @@ Here are all the options it supports.
 | -t, --timeout                   | Max. time allowed for proxy server/check (default: 30s).      |
 | -r, --rotate `<AFTER>`          | Rotate proxy IP for every `AFTER` request (default: 1).       |
 |     --rotate-on-error           | Rotate proxy IP and retry failed HTTP requests.               |
-|     --max-errors `<N>`          | Max. errors allowed during rotation (default:3).              |
+|     --remove-on-error           | Remove proxy IP from proxy pool on failed HTTP requests.      |
+|     --max-errors `<N>`          | Max. errors allowed during rotation (default: 3).             |
 |                                 | Use this with `--rotate-on-error`.                            |
 |     --max-redirs `<N>`          | Max. redirects allowed (default: 10).                         |
 |     --max-retries `<N>`         | Max. retries for failed HTTP requests (default: 0).           |