[CLEANUP] Drop the StyleCI badge from the README (#144)
[CLEANUP] Drop the StyleCI badge from the README (#144)

[ci skip]

This repository no longer uses StyleCI. So the badge does not work anymore
and schould go.
phpList/phplist3,bramley/phplist3,mariez/phplist3,bramley/phplist3,mariez/phplist3,mariez/phplist3,danwaterloo/phplist3,danwaterloo/phplist3,mariez/phplist3,phpList/phplist3,bramley/phplist3,samtuke/phplist3,mariez/phplist3,phpList/phplist3,samtuke/phplist3,danwaterloo/phplist3,bramley/phplist3,danwaterloo/phplist3,samtuke/phplist3,samtuke/phplist3,bramley/phplist3,samtuke/phplist3,phpList/phplist3,phpList/phplist3,danwaterloo/phplist3