lib/plugins/plugin/uninstall/uninstall.js/PluginUninstall/uninstallPeerDependencies
class PluginUninstall:  uninstallPeerDependencies() {
    const pluginPackageJsonFilePath = path.join(
      this.serverless.config.servicePath,
      'node_modules',
      this.options.pluginName,
      'package.json'
    );
    return fse
      .readJsonAsync(pluginPackageJsonFilePath)
      .then(pluginPackageJson => {
        if (pluginPackageJson.peerDependencies) {
          const pluginsArray = [];
          _.forEach(pluginPackageJson.peerDependencies, (v, k) => {
            pluginsArray.push(k);
          });
          return BbPromise.map(pluginsArray, this.npmUninstall);
        }
        return BbPromise.resolve();
      })
      .catch(() => BbPromise.resolve());
  }