Update history and version to 6.1.1 (#5171)

Summary:
Including latest fixes.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5171

Differential Revision: D14875157

Pulled By: gfosco

fbshipit-source-id: 86ec7ee3553a9b25ab71ed98966ce08a16322e2c

HISTORY.md

@@ -1,6 +1,6 @@
 # Rocksdb Change Log
 
-### Unreleased
+## 6.1.1 (4/9/2019)
 ### New Features
 * When reading from option file/string/map, customized comparators and/or merge operators can be filled according to object registry.
 * Introduce Periodic Compaction for Level style compaction. Files are re-compacted periodically and put in the same level.

include/rocksdb/version.h

@@ -6,7 +6,7 @@
 
 #define ROCKSDB_MAJOR 6
 #define ROCKSDB_MINOR 1
-#define ROCKSDB_PATCH 0
+#define ROCKSDB_PATCH 1
 
 // 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