travis: put back node 5
travis: put back node 5

Level/rocksdb,ralphtheninja/leveldown,Level/rocksdb,ralphtheninja/leveldown,Level/leveldown,MathieuCassagne/leveldown,MathieuCassagne/leveldown,ralphtheninja/leveldown,Level/rocksdb,Level/leveldown,ralphtheninja/leveldown,MathieuCassagne/leveldown,MathieuCassagne/leveldown,ralphtheninja/leveldown,Level/leveldown,MathieuCassagne/leveldown