Update history and version for future 6.2.0 (#5270)

Summary:
Update history before branch cut.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5270

Differential Revision: D15153700

Pulled By: gfosco

fbshipit-source-id: 2c81e01a2ab965661b1d88209dca74ba0a3756cb

HISTORY.md

@@ -1,5 +1,7 @@
 # Rocksdb Change Log
 ## Unreleased
+
+## 6.2.0 (4/30/2019)
 ### New Features
 * Add an option `strict_bytes_per_sync` that causes a file-writing thread to block rather than exceed the limit on bytes pending writeback specified by `bytes_per_sync` or `wal_bytes_per_sync`.
 * Improve range scan performance by avoiding per-key upper bound check in BlockBasedTableIterator.

include/rocksdb/version.h

@@ -5,8 +5,8 @@
 #pragma once
 
 #define ROCKSDB_MAJOR 6
-#define ROCKSDB_MINOR 1
-#define ROCKSDB_PATCH 1
+#define ROCKSDB_MINOR 2
+#define ROCKSDB_PATCH 0
 
 // Do not use these. We made the mistake of declaring macros starting with
 // double underscore. Now we have to live with our choice. We'll deprecate these