Update Travis configuration.
Update Travis configuration.

No builds seemed to happen since the last change.

N3da/avsc,cdapio/ui-schema-parser,mtth/avsc,cdapio/ui-schema-parser,mtth/avsc,cdapio/ui-schema-parser,mtth/avsc,cdapio/ui-schema-parser,mtth/avsc,N3da/avsc,mtth/avsc,N3da/avsc,cdapio/ui-schema-parser,N3da/avsc,N3da/avsc