title: Change bunyan log color for different levels
body: <p>When using Bunyan, all my log levels use the same cyan color, like so:</p>
  
  <p><a href="https://i.stack.imgur.com/tIWEv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tIWEv.png" alt="enter image description here"></a></p>
  
  <p>Here is the Bunyan configuration we are using:</p>
  
  <pre><code>const bunyan = require('bunyan');
  module.exports = bunyan.createLogger({name: 'cdt-api-server'});
  </code></pre>
  
  <p>My question is - how can I get Bunyan to use red or magenta for logging error information / stack traces? The problem is that "ERROR" in red characters is not enough to capture my attention - I'd like to have the whole stack in red or magenta.</p>
  
  <p>Here is the Bunyan readme:
  <a href="https://github.com/trentm/node-bunyan" rel="noreferrer">https://github.com/trentm/node-bunyan</a></p>
  
  <p>I only see "color" mentioned once.</p>
  
  <p>Can we do something like this?</p>
  
  <pre><code>const bunyan = require('bunyan');
  
  module.exports = bunyan.createLogger({
    name: 'cdt-api-server',
    streams: [
      {
        level: 'trace',
        stream: process.stdout,
        color: 'black',
      },
      {
        level: 'debug',
        stream: process.stdout,
        color: 'blue',
      },
      {
        level: 'info',
        stream: process.stdout,
        color: 'cyan',
      },
      {
        level: 'error',
        path: process.stderr,
        color: 'red'
      },
      {
        level: 'warn',
        path: process.stderr,
        color: 'magenta'
      }
    ]
  });
  </code></pre>