logfile does not contain exception messages

[staabm]

Q	A
Issue Type	Feature Request
Deployer Version	6.0.3
Local Machine OS	N/A
Remote Machine OS	N/A

Description

when using the --log option I see the progress and messages of the deployment in the given logfile.
when the deployment runs into a exception and stopps, the message of the exception is missing from the logfile.

it would be very helpful to have at least the message of the occured exception in the logfile, at best even the stacktrace next to it.

Steps to reproduce

dep errors --log deployer.log

Content of deploy.php

namespace Deployer;

require 'recipe/common.php';

task('errors', function() {
    run('echo "test"'); // create some output, works correctly
    throw new \Exception("boooom!"); // this exception message is missing from the logfile
});

Output log

With enabled option for verbose output -vvv.

[localhost] > echo "test"
[localhost] < test

[staabm]

Implemented with #1482