Fix parsing when quote is escaped inside quoted column containing delimiter (#318)

[risseraka]

Hi @Keyang,

As explained in #318, parsing fails if escape character is specified (and different than "), and a delimiter is between escaped quotes.

A few examples (with option escape='\'):

id,raw 0,"hello,world" // OK raw: hello,world 1,"hello,\"world" // OK raw: hello,"world 2,"hello\",world" // KO raw: hello\" field3: world 3,"\"hello,world\"" // KO raw: "\"hello" field3: world\" 4,"\"hello,\"world\"" // KO raw: "\hello field3: \"world\"" 5,"\"hello\",world\"" // OK raw: "hello",world" 6,"\"hello\",\"world\"" // OK raw: "hello","world" 

With this fix:

0,"hello,world" // OK raw: hello,world 1,"hello,\"world" // OK raw: hello,"world 2,"hello\",world" // OK raw: hello",world 3,"\"hello,world\"" // OK raw: "hello,world" 4,"\"hello,\"world\"" // OK raw: "hello,"world" 5,"\"hello\",world\"" // OK raw: "hello",world" 6,"\"hello\",\"world\"" // OK raw: "hello","world" 

Hope you will review this pull request, as it seems like you haven't maintained the repo since last year.
Great work, by the way.

Cheers,
Adrien.

[coveralls]

Pull Request Test Coverage Report for Build 194

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 95.423%

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Files with Coverage Reduction	New Missed Lines	%
src/util.ts	1	61.54%

Totals
Change from base Build 190:	0.3%
Covered Lines:	643
Relevant Lines:	660

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💛 - Coveralls

[Keyang]

Thanks a million !
Sorry for lack of response. Super busy in the last months.

[Keyang]

LGTM

[risseraka]

Good hearing back from you.
Cheers!