ImportError while loading conftest '/build/python-pygls/src/pygls-0.11.2/tests/conftest.py'.
tests/conftest.py:25: in <module>
    import pygls.lsp.methods
pygls/lsp/__init__.py:23: in <module>
    from pygls.lsp.types import *
pygls/lsp/types/__init__.py:2: in <module>
    from pygls.lsp.types.basic_structures import *
pygls/lsp/types/basic_structures.py:30: in <module>
    from pydantic import BaseModel, root_validator
E   ModuleNotFoundError: No module named 'pydantic'
==> ERROR: A failure occurred in check().
    Aborting...