Generates invalid SQL when data contains single quotes

[IlyaSemenov]

The script generates invalid SQL when data contains single quotes.

Steps to reproduce:

curl -O https://gnivc.ru/html/gnivcsoft/KLADR/Base.7z
7zr x Base.7z
sqlite3-dbf STREET.DBF | iconv -f cp866 -t utf8 | grep 56000004000969900

Result:

INSERT INTO street VALUES('СНТСН № 15 совхоза 'Садовод'','тер','56000004000969900','462401','5614','','53423000000');

(leads to "Error: near "Садовод": syntax error" in sqlite3)

Expected:

INSERT INTO street VALUES('СНТСН № 15 совхоза ''Садовод''','тер','56000004000969900','462401','5614','','53423000000');

[IlyaSemenov]

I see there's a PR for this already... #4