v5.4.4: `autoFixConflicts` option and redact access token in logs

• Redact access token from logs (#207)
• Add autoFixConflicts option (#206)

Example:

// backport.js
require('backport').run({
  async autoFixConflicts(files, directory, log) {
    const didFix = customLogicForFixingConflicts(files, directory, log);
    return didFix;
  }
})

node backport.js