fix bash completion with space

[casperdcl]

fixes #74

(vis. https://stackoverflow.com/questions/1146098/properly-handling-spaces-and-quotes-in-bash-completion)

[sourcery-ai[bot]]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	30.54 😞	30.54 😞	0.00
Method Length	87.98 🙂	87.98 🙂	0.00
Working memory	15.03 😞	15.03 😞	0.00
Quality	43.25% 😞	43.25% 😞	0.00%

Other metrics	Before	After	Change
Lines	1283	1284	1

Changed files	Quality Before	Quality After	Quality Change
shtab/init.py	29.55% 😞	29.55% 😞	0.00%
tests/test_shtab.py	78.96% ⭐	78.96% ⭐	0.00%

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

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
shtab/init.py	get_bash_commands	78 ⛔	500 ⛔	26 ⛔	2.75% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
shtab/init.py	complete_zsh	62 ⛔	752 ⛔	25 ⛔	3.53% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
shtab/init.py	get_bash_commands.recurse	58 ⛔	447 ⛔	26 ⛔	4.47% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
shtab/init.py	complete_tcsh	53 ⛔	398 ⛔	19 ⛔	8.79% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
shtab/init.py	complete_zsh.recurse	18 🙂	214 ⛔	16 ⛔	31.98% 😞	Try splitting into smaller methods. Extract out complex expressions

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[casperdcl]

/tag v1.5.5 60a8525