csvstack to support --skip-lines

Created by: shahbour

First , great library.

It was very handy in searching big csv files , i just needed to search a complete folder full of csv that each file has a header that should be ignored by using latest version 1.0.2 --skip-lines it was possible but file by file . i tried using csvstack but it did not recognise the parameter --skip-lines

Alis-Mac-mini:sonus shahbour$ csvgrep --skip-lines 1 -c 20 -r "^449" -H  20170219013000.1014D6F.ACT.gz | csvgrep -c 21 -r "^639"  | csvcut  -c 20,21    
t,u
44971506961058,639398219637
44971504921587,639106889971
44971569097874,639291643991
44971568622691,639101981790
44971543461612,639495761895
44971502473650,639287415793
44971543544583,639183191196
44971569097874,639291643991
44971566267135,639293255451
44971507677524,639108700472

Alis-Mac-mini:sonus shahbour$ csvstack -H --skip-lines 1 * | csvgrep -c 20 -r "^449" | csvgrep -c 21 -r "^639"  | csvcut  -c 20,21                 
usage: csvstack [-h] [-d DELIMITER] [-t] [-q QUOTECHAR] [-u {0,1,2,3}] [-b]
                [-p ESCAPECHAR] [-z FIELD_SIZE_LIMIT] [-e ENCODING] [-S] [-H]
                [-v] [-l] [--zero] [-V] [-g GROUPS] [-n GROUP_NAME]
                [--filenames]
                FILE [FILE ...]
csvstack: error: unrecognized arguments: --skip-lines