update readme to be slightly more clear about prereqs
update readme to be slightly more clear about prereqs

KentShikama/diaspora,Flaburgan/diaspora,Muhannes/diaspora,diaspora/diaspora,SuperTux88/diaspora,Muhannes/diaspora,Flaburgan/diaspora,geraspora/diaspora,geraspora/diaspora,SuperTux88/diaspora,Flaburgan/diaspora,Flaburgan/diaspora,KentShikama/diaspora,geraspora/diaspora,spixi/diaspora,KentShikama/diaspora,spixi/diaspora,Muhannes/diaspora,Amadren/diaspora,jhass/diaspora,Amadren/diaspora,geraspora/diaspora,diaspora/diaspora,despora/diaspora,jhass/diaspora,Amadren/diaspora,diaspora/diaspora,KentShikama/diaspora,diaspora/diaspora,despora/diaspora,Amadren/diaspora,SuperTux88/diaspora,spixi/diaspora,spixi/diaspora,despora/diaspora,jhass/diaspora,SuperTux88/diaspora,despora/diaspora,Muhannes/diaspora,jhass/diaspora