Remove wrong whitespace char in CONTRIBUTING
Remove wrong whitespace char in CONTRIBUTING

It was accidentally added in a previous change.

Signed-off-by: thc202 <43af82ef30812a20fbcf38b99a6f72cdd3a89ac1@gmail.com>

psiinon/zaproxy,Ali-Razmjoo/zaproxy,Ali-Razmjoo/zaproxy,thc202/zaproxy,gmaran23/zaproxy,zaproxy/zaproxy,gmaran23/zaproxy,thc202/zaproxy,psiinon/zaproxy,kingthorin/zaproxy,thc202/zaproxy,zaproxy/zaproxy,meitar/zaproxy,meitar/zaproxy,gmaran23/zaproxy,gmaran23/zaproxy,Ali-Razmjoo/zaproxy,meitar/zaproxy,zaproxy/zaproxy,kingthorin/zaproxy,kingthorin/zaproxy,meitar/zaproxy,meitar/zaproxy,kingthorin/zaproxy,meitar/zaproxy,psiinon/zaproxy,kingthorin/zaproxy,thc202/zaproxy,Ali-Razmjoo/zaproxy,thc202/zaproxy,gmaran23/zaproxy,meitar/zaproxy,kingthorin/zaproxy,Ali-Razmjoo/zaproxy,thc202/zaproxy,psiinon/zaproxy,zaproxy/zaproxy,psiinon/zaproxy,zaproxy/zaproxy,psiinon/zaproxy,meitar/zaproxy,Ali-Razmjoo/zaproxy,psiinon/zaproxy,zaproxy/zaproxy,gmaran23/zaproxy,thc202/zaproxy,kingthorin/zaproxy,zaproxy/zaproxy,Ali-Razmjoo/zaproxy,gmaran23/zaproxy