code: function uploadFile(endpoint, releaseVersion, filePath) {
    // sentry lets you use the tilde to indicate it just looks at relative locations
    // instead of relying on the host/domain.
    var IGNORE_DOMAIN = '~';
    var staticBase = process.env.STATIC_BASE;
    var IGNORE_PATH = staticBase ? url.parse(staticBase).path + '/' : '';
    var CONFLICT_CODE = 409;
  
    var fileData = path.parse(filePath);
    var fileName = fileData.name + fileData.ext;
    var sentryFilePath = IGNORE_DOMAIN + IGNORE_PATH + fileName;
  
    return new Promise(function(resolve, reject) {
      superagent
        .post(endpoint)
        .set(HEADERS)
        .attach('file', filePath)
        .field('name', sentryFilePath)
        .end(function(err, res) {
          if (!err) {
            console.log('Sentry (release: ' + releaseVersion +
              ') - Successfully uploaded ' + fileName);
            resolve();
          } if (err && err.response && err.response.statusCode === CONFLICT_CODE) {
            console.log('Sentry (' + releaseVersion + ') - ' + fileName +
              ' already exists.');
            resolve();
          } else {
            reject(err);
          }
        });
    });
  }
docs: Uploads a single file to a selected release.
  @param {String} endpoint
  The endpoint to push these files to
  @param {String} releaseVersion
  The release version for this file
  @param {String} filePath
  The absolute file path for the file we want to upload to the release