fix: Completions with special characters (e.g. '"&$`) are quoted

[domsleee]

Mentioned #24 (comment)

New behaviour is to add single quotes around completions with special characters.

An example package.json file:

{
    "scripts": {
        "with space": "echo hello world",
        "withsingle'quote": "echo hello world",
        "withdouble\"quote": "echo hello world",
        "with`backtick": "echo hello world",
        "with&ampersand": "echo hello world",
        "with$dollar": "echo hello world"
    }
}

Old	New
with space	'with space'
withsingle'quote	'withsingle''quote'
withsingle"quote	'withdouble"quote'
with`backtick"	'with`backtick'
with&ampersand	'with&ampersand'
with$dollar	'with$dollar'