old_contents: #!/usr/bin/env node
  var https = require('https'),
      githubUser = process.env.GITHUB_USERNAME,
      githubKey = process.env.GITHUB_KEY;
  
new_contents: #!/usr/bin/env node
  var https = require('https'),
      githubUser = process.env.GITHUB_USERNAME,
      githubKey = process.env.GITHUB_KEY;
  
  var headers = {
    'User-Agent': 'RepoKit/0.0.1'
  };
subject: prepare user-agent header