Update HISTORY.md and version.h for 7.0.3

Summary: Also clarified in HISTORY.md that this patch release breaks
binary compatibility (because of FilterPolicy vtable)

HISTORY.md

@@ -1,11 +1,11 @@
 # Rocksdb Change Log
-## Unreleased
+## 7.0.3 (03/23/2022)
 ### Bug Fixes
 * Fixed a major performance bug in which Bloom filters generated by pre-7.0 releases are not read by early 7.0.x releases (and vice-versa) due to changes to FilterPolicy::Name() in #9590. This can severely impact read performance and read I/O on upgrade or downgrade with existing DB, but not data correctness.
 * Fixed a bug that `Iterator::Refresh()` reads stale keys after DeleteRange() performed.
 
 ### Public API changes
-* Added pure virtual FilterPolicy::CompatibilityName(), which is needed for fixing major performance bug involving FilterPolicy naming in SST metadata without affecting Customizable aspect of FilterPolicy. This change only affects those with their own custom or wrapper FilterPolicy classes.
+* Added pure virtual FilterPolicy::CompatibilityName(), which is needed for fixing major performance bug involving FilterPolicy naming in SST metadata without affecting Customizable aspect of FilterPolicy. For source code, this change only affects those with their own custom or wrapper FilterPolicy classes, but does break compiled library binary compatibility in a patch release.
 
 ## 7.0.2 (03/12/2022)
 * Fixed a bug that DisableManualCompaction may assert when disable an unscheduled manual compaction.

include/rocksdb/version.h

@@ -11,7 +11,7 @@
 
 #define ROCKSDB_MAJOR 7
 #define ROCKSDB_MINOR 0
-#define ROCKSDB_PATCH 2
+#define ROCKSDB_PATCH 3
 
 // 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