Fix MatrixClientPeg imports

src/Unread.js

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-const MatrixClientPeg = require('./MatrixClientPeg');
+import {MatrixClientPeg} from "./MatrixClientPeg";
 import shouldHideEvent from './shouldHideEvent';
 const sdk = require('./index');