v1.0.0

This is the first stable release of sshtun.

Some changes from v0 have been made:

• Start() receives a context. The tunnel can be stopped canceling the context or by calling Stop().
• The ssh connection is only made when a tunneled connection is accepted, and all tunneled connections share the same ssh connection.
• A SetTunneledConnState() method has been added. It allows to provide an optional callback that receives updates on the underlying tunneled connections status.
• Removed Debug() method, the package does not import log package.
• The default key files searched have been modified to be coherent with what ssh client does.
• Upgraded dependencies, as vulnerabilities in the ssh package have been found.