Хочу установить discord.py на ubuntu 14.04, появляется ошибка

Хочу установить discord.py на ubuntu 14.04, появляется ошибка:

python3 -m pip install -U discord.py
Downloading/unpacking discord.py
  Downloading discord.py-1.3.3-py3-none-any.whl (676kB): 676kB downloaded
Downloading/unpacking aiohttp>=3.6.0,<3.7.0 (from discord.py)
  Downloading aiohttp-3.6.2-py3-none-any.whl (441kB): 441kB downloaded
Downloading/unpacking websockets>=6.0,!=7.0,!=8.0,!=8.0.1,<9.0 (from discord.py)
  Downloading websockets-8.1.tar.gz (58kB): 58kB downloaded
  Running setup.py (path:/tmp/pip_build_root/websockets/setup.py) egg_info for package websockets
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/tmp/pip_build_root/websockets/setup.py", line 12, in <module>
        long_description = (root_dir / 'README.rst').read_text(encoding='utf-8')
    AttributeError: 'PosixPath' object has no attribute 'read_text'
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/tmp/pip_build_root/websockets/setup.py", line 12, in <module>

    long_description = (root_dir / 'README.rst').read_text(encoding='utf-8')

AttributeError: 'PosixPath' object has no attribute 'read_text'

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_root/websockets
Storing debug log for failure in /root/.pip/pip.log
root@69336:~#