Clean gulp completions

[tbhaxor]

Description

Similar fix as defined in #2136

Motivation and Context

Help clean bashit #1696

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• If my change requires a change to the documentation, I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• If I have added a new file, I also added it to clean_files.txt and formatted it using lint_clean_files.sh.
• I have added tests to cover my changes, and all the new and existing tests pass.

[NoahGorny]

this also does not always work sadly

[tbhaxor]

@NoahGorny It is working

 2022-05-20 08:00:37 ⌚  36f05b99f861 in /my-project
○ → git clone --branch improve/gulp-completion  https://github.com/tbhaxor/bash-it.git ~/.bash_it -q

 2022-05-20 08:00:45 ⌚  36f05b99f861 in /my-project
○ → ~/.bash_it/install.sh 

 2022-05-20 08:00:52 ⌚  36f05b99f861 in /my-project
○ → cat ~/.bash_it/completion/available/gulp.completion.bash 
# shellcheck shell=bash

if _command_exists gulp; then
        eval "$(gulp --completion=bash)"
fi

 2022-05-20 08:01:07 ⌚  36f05b99f861 in /my-project
○ → bashit enable completion gulp
gulp enabled with priority 350.

 2022-05-20 08:01:15 ⌚  36f05b99f861 in /my-project
○ → bashit restart 

 2022-05-20 08:01:21 ⌚  36f05b99f861 in /my-project
○ → gulp 
default  help     todo     

 2022-05-20 08:01:21 ⌚  36f05b99f861 in /my-project
○ → gulp 
default  help     todo     

 2022-05-20 08:01:21 ⌚  36f05b99f861 in /my-project
○ → gulp 
[08:01:40] Using gulpfile /my-project/gulpfile.js
[08:01:40] Starting 'default'...
[08:01:40] Finished 'default' after 2.39 ms

I have tested this in GNU bash, version 5.1.16(1)-release (x86_64-alpine-linux-musl)

[tbhaxor]

Timeout