pyflakes instead of flake8 in readme.md

[hongy19]

in the readme.md, it metioned flake8 and pytcondetype configration, then then it mentioned "The default configuration sources are pycodestyle and pyflakes".
is it mistake that pyflakes should be flake8?

'''
python-lsp-server depends on other tools, like flake8 and pycodestyle. These tools can be configured via settings passed from the client (as above), or alternatively from other configuration sources. The following sources are available:

pycodestyle: discovered in ~/.config/pycodestyle, setup.cfg, tox.ini and pycodestyle.cfg.
flake8: discovered in .flake8, setup.cfg and tox.ini
The default configuration sources are pycodestyle and pyflakes
'''