Incompatibility between jedi version required by spyder and pinned jedi version.

[SebastianoF]

ERROR: spyder 4.0.1 has requirement jedi==0.14.1, but you'll have jedi 0.15.2 which is incompatible.

I think the quickest solution is to remove jedi from the requirements, unless you do not need the specific version required by this library.
Less quick solution is to use pip-compile.

Let me know which one do you prefer, I can send a PR!