Add Ruby dependency to installation instructions
Add Ruby dependency to installation instructions

mikemackintosh/gitrob,drptbl/gitrob,Beercow/gitrob,mikeli/gitrob,johan--/gitrob,mikemackintosh/gitrob,promisejohn/gitrob,sechacking/gitrob,johan--/gitrob,LubyRuffy/gitrob,adamdecaf/gitrob,LubyRuffy/gitrob,kod3r/gitrob,mikeli/gitrob,adamdecaf/gitrob,promisejohn/gitrob,promisejohn/gitrob,mikeli/gitrob,mikemackintosh/gitrob,sechacking/gitrob,kod3r/gitrob,Beercow/gitrob,Beercow/gitrob,LubyRuffy/gitrob,drptbl/gitrob,adamdecaf/gitrob,johan--/gitrob,kod3r/gitrob,drptbl/gitrob,sechacking/gitrob