Update release note of 3.4
Summary: N/A Test Plan: N/A Reviewers: yhchiang, ljin Reviewed By: ljin Subscribers: dhruba, leveldb, igor Differential Revision: https://reviews.facebook.net/D22053
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### Unreleased
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### New Features
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### Public API changes
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* The Prefix Extractor used with V2 compaction filters is now passed user key to SliceTransform::Transform instead of unparsed RocksDB key.
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## 3.4.0 (8/18/2014)
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### New Features
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* Support Multiple DB paths in universal style compactions
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* Add feature of storing plain table index and bloom filter in SST file.
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* CompactRange() will never output compacted files to level 0. This used to be the case when all the compaction input files were at level 0.
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* Statistics APIs now take uint32_t as type instead of Tickers. Also make two access functions getTickerCount and histogramData const
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* Add DB property rocksdb.estimate-num-keys, estimated number of live keys in DB.
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* Add DB::GetIntProperty(), which returns DB properties that are integer as uint64_t.
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* The Prefix Extractor used with V2 compaction filters is now passed user key to SliceTransform::Transform instead of unparsed RocksDB key.
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## 3.3.0 (7/10/2014)
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### New Features
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