Bumping version to 5.8

Summary: Closes https://github.com/facebook/rocksdb/pull/2738

Differential Revision: D5736261

Pulled By: maysamyabandeh

fbshipit-source-id: 49d27e9ccd786c4056a3d586a060fe460ea883ac

HISTORY.md

 # Rocksdb Change Log
 ## Unreleased
 ### Public API Change
+### New Features
+### Bug Fixes
+
+## 5.8.0 (08/30/2017)
+### Public API Change
 * Users of `Statistics::getHistogramString()` will see fewer histogram buckets and different bucket endpoints.
 * `Slice::compare` and BytewiseComparator `Compare` no longer accept `Slice`s containing nullptr.
+* `Transaction::Get` and `Transaction::GetForUpdate` variants with `PinnableSlice` added.
 
 ### New Features
 * Add Iterator::Refresh(), which allows users to update the iterator state so that they can avoid some initialization costs of recreating iterators.

include/rocksdb/version.h

@@ -5,7 +5,7 @@
 #pragma once
 
 #define ROCKSDB_MAJOR 5
-#define ROCKSDB_MINOR 7
+#define ROCKSDB_MINOR 8
 #define ROCKSDB_PATCH 0
 
 // Do not use these. We made the mistake of declaring macros starting with