update username in your origin remote url

rename-remote-origin.sh

# OR traverse all repos from parent directory at once running following commmand
# traverses all children repositories
# outputs current directory
# changes color of the output for readability
# matches your current origin with your past username and substitutes it with new one
# eg.: git@github.com:gargol/Ghost is transformed into git@github.com:naz/Ghost
# changes "origin" url to the new address
# outputs current origin details
find . -maxdepth 1 -type d \( ! -name . \) -exec bash -c  "cd '{}' && pwd && tput setaf 3; git remote --v | grep :gargol | sed -r 's/:gargol/:naz/g' | grep -o 'git@github.com:naz\/[a-zA-Z-]*' | head -1 | xargs git remote set-url origin && git remote --v | grep origin" \;

# do above within single repo
git remote --v | grep :gargol | sed -r 's/:gargol/:naz/g' | grep -o 'git@github.com:naz\/[a-zA-Z-]*' | head -1 && xargs git remote set-url origin && git remote --v | grep origin