code: function updateNpmVersion(pluginConfig, config, callback) {
      const files = readFilePaths(FILES);
      const version = config.nextRelease.version;
      let git = "";
  
      for (let i = 0; i < files.length; i++) {
        // update
        const file = files[i];
        const content = readContent(file);
        const updated = updateVersion(file, content, version);
  
        // save
        git += `git add ${file} && `;
        saveContent(file, updated);
      }
      // publish
      isChange && commitChanges(git, version);
    }
docs: updates the npm version in semantic-release pre