updated travis.yml to mention redis
updated travis.yml to mention redis

shaicoleman/slanger,markburns/slanger,loggator/slanger,notnoopci/slanger,daande/slanger,amvse/slanger,amvse/slanger,notnoopci/slanger,jiren/slanger,loggator/slanger,shaicoleman/slanger,jiren/slanger,carlos-ramos-mojix-com/slanger,stevegraham/slanger,ambrish123456/testSlanger,carlos-ramos-mojix-com/slanger,ambrish123456/testSlanger,stevegraham/slanger,daande/slanger,markburns/slanger