Update history for future 5.13 release

Summary: Closes https://github.com/facebook/rocksdb/pull/3631

Differential Revision: D7367519

Pulled By: gfosco

fbshipit-source-id: 57826cc1c9ffc9f2b351075567b8ad929809cb74

HISTORY.md

 # Rocksdb Change Log
 ## Unreleased
 ### Public API Change
+
+### New Features
+
+### Bug Fixes
+
+
+## 5.13.0 (3/20/2018)
+### Public API Change
 * RocksDBOptionsParser::Parse()'s `ignore_unknown_options` argument will only be effective if the option file shows it is generated using a higher version of RocksDB than the current version.
 * Remove CompactionEventListener.
 

include/rocksdb/version.h

@@ -5,7 +5,7 @@
 #pragma once
 
 #define ROCKSDB_MAJOR 5
-#define ROCKSDB_MINOR 12
+#define ROCKSDB_MINOR 13
 #define ROCKSDB_PATCH 0
 
 // Do not use these. We made the mistake of declaring macros starting with