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

This reverts commit b8f8280, reversing
changes made to 3587f5b.

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

Author: Carreau

setup.py

@@ -183,15 +183,15 @@
 )
 
 install_requires = [
-    "setuptools>=18.5",
-    "jedi>=0.16,<0.18.0",
-    "decorator",
-    "pickleshare",
-    "traitlets>=4.2",
-    "prompt_toolkit>=2.0.0,<3.1.0,!=3.0.0,!=3.0.1",
-    "pygments",
-    "backcall",
-    "stack_data",
+    'setuptools>=18.5',
+    'jedi>=0.16',
+    'decorator',
+    'pickleshare',
+    'traitlets>=4.2',
+    'prompt_toolkit>=2.0.0,<3.1.0,!=3.0.0,!=3.0.1',
+    'pygments',
+    'backcall',
+    'stack_data',
 ]
 
 # Platform-specific dependencies: