fix(composer.json): Update required PHP version to 7.0
fix(composer.json): Update required PHP version to 7.0

Should have been part of 37bd983bf0cc956a6c814f161bec1061e9cc9572

Signed-off-by: Florian Pritz <753f544d2d01592750fb4bd29251b78abcfc8ecd@xinu.at>

Bluewind/filebin,Bluewind/filebin,Bluewind/filebin,Bluewind/filebin,Bluewind/filebin