doc: Remove mentioning of nc for bastion host.

Author: junkern

README.md

@@ -26,8 +26,6 @@ $ yarn add node-ssh-forward
 
 Setting up the initial ssh connection (using a bastion host)
 
-Bastion host **needs** access to `nc`([netcat](https://en.wikipedia.org/wiki/Netcat)) command, for example the AMIs of newer AWS [Linux 2](https://aws.amazon.com/amazon-linux-2/) instances don't have it installed in their base package
-
 ```js
 import { SSHConnection } from 'node-ssh-forward'