Update Developers-Guide.md
Update Developers-Guide.md

remove old /opt/intelmq/bin directory documentation
robcza/intelmq,pkug/intelmq,aaronkaplan/intelmq,pkug/intelmq,certtools/intelmq,robcza/intelmq,certtools/intelmq,robcza/intelmq,pkug/intelmq,aaronkaplan/intelmq,certtools/intelmq,aaronkaplan/intelmq,pkug/intelmq,robcza/intelmq