Update Travis CI config
Update Travis CI config

vt0r/k-9,cketti/k-9,dgger/k-9,jca02266/k-9,ndew623/k-9,k9mail/k-9,philipwhiuk/q-mail,mawiegand/k-9,indus1/k-9,k9mail/k-9,indus1/k-9,k9mail/k-9,philipwhiuk/q-mail,cketti/k-9,vatsalsura/k-9,vt0r/k-9,jca02266/k-9,mawiegand/k-9,philipwhiuk/k-9,jca02266/k-9,cketti/k-9,roscrazy/k-9,dgger/k-9,philipwhiuk/k-9,mawiegand/k-9,ndew623/k-9,cketti/k-9,ndew623/k-9,philipwhiuk/q-mail,vatsalsura/k-9,roscrazy/k-9,dgger/k-9