Error on running setup.sh file in macOs

I was trying to follow the course and noticed that setup.sh file script is not working for Mac-os
therefore I came up with this solution

```
#!/bin/bash
# mosOS
# export LC_CTYPE=C
# find . -type -exec sed -i '' "s/{dockerHubUsername}/$1/g" {} +

# linux
find . -type f -exec sed -i 's/{dockerHubUsername}/'$1'/g' {} +
