Revert "Merge pull request #12757 from dangreenisrael/patch-1"
Revert "Merge pull request #12757 from dangreenisrael/patch-1"

This reverts commit b8f8280802fe3b53ece56b3cd1e8d47730836106, reversing
changes made to 3587f5bb6c8570e7bbb06cf5f7e3bc9b9467355a.

IPython master is compatible with jedi 0.18, it's the 7.x branch which
is not

ipython/ipython,ipython/ipython