code: function readYaml(filePath) {
      return new Promise((resolve, reject) => {
          if (!filePath || typeof filePath !== 'string') {
              throw new Error('Path must be a string');
          }
          fs.readFile(filePath, (err, data) => {
              if (err) {
                  return reject(err);
              }
              // Remove UTF-8 BOM if present
              if (data.length >= 3 && data[0] === 0xef &&
                  data[1] === 0xbb && data[2] === 0xbf) {
                  data = data.slice(3);
              }
              try {
                  return resolve(yaml.safeLoad(data));
              } catch (yamlerr) {
                  return reject(yamlerr);
              }
          });
      });
  }
docs: Read and parse configuration file from disc
  
  @param {string} filePath Path of file to read
  @param {configComplete} callback Completion callback
  @returns {Promise<*>} Resolves tyo YAML parsed configuration file