fix prompt-toolkit version

[krnick]

Fixs issue #186.

[sourcery-ai]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	0.00 ⭐	0.00 ⭐	0.00
Method Length	65.00 🙂	65.00 🙂	0.00
Working memory	15.00 😞	15.00 😞	0.00
Quality	66.25% 🙂	66.25% 🙂	0.00%

Other metrics	Before	After	Change
Lines	42	42	0

Changed files	Quality Before	Quality After	Quality Change
setup.py	66.25% 🙂	66.25% 🙂	0.00%

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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[codecov-commenter]

Codecov Report

Merging #187 (4c4bc58) into master (26aaa6c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #187   +/-   ##
=======================================
  Coverage   73.58%   73.58%           
=======================================
  Files          35       35           
  Lines        1772     1772           
=======================================
  Hits         1304     1304           
  Misses        468      468           

Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)

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