remove leveldb .travis.yml
remove leveldb .travis.yml

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