Updated travis build config
Updated travis build config

It sets the path to the date library correctly now.

rettichschnidi/sqlpp11,rettichschnidi/sqlpp11,volka/sqlpp11,happybits/sqlpp11,rbock/sqlpp11,sergeken/sqlpp11,rettichschnidi/sqlpp11,volka/sqlpp11,rbock/sqlpp11,sergeken/sqlpp11,happybits/sqlpp11,rbock/sqlpp11,sergeken/sqlpp11,rettichschnidi/sqlpp11,sergeken/sqlpp11,volka/sqlpp11,happybits/sqlpp11,rbock/sqlpp11,volka/sqlpp11,happybits/sqlpp11