mdbx: Happy New Year! (release v0.11.3).

Acknowledgements:
-----------------

 - [gcxfd <i@rmw.link>](https://github.com/gcxfd) for reporting, contributing and testing.
 - [장세연 (Чан Се Ен)](https://github.com/sasgas) for reporting and testing.
 - [Alex Sharov](https://github.com/AskAlexSharov) for reporting, testing and provide resources for remote debugging/investigation.

New features, extensions and improvements:
------------------------------------------

 - [Added](#236) `mdbx_cursor_get_batch()`.
 - [Added](#250) `MDBX_SET_UPPERBOUND`.
 - C++ API is finalized now.
 - The GC update stage has been [significantly speeded](#254) when fixing huge Erigon's transactions (Ethereum ecosystem).

Fixes:
------

 - Disabled C++20 concepts for stupid AppleClang 13.x
 - Fixed internal collision of `MDBX_SHRINK_ALLOWED` with `MDBX_ACCEDE`.

Minors:
-------

 - Fixed returning `MDBX_RESULT_TRUE` (unexpected -1) from `mdbx_env_set_option()`.
 - Added `mdbx_env_get_syncbytes()` and `mdbx_env_get_syncperiod()`.
 - [Clarified](#249) description of `MDBX_INTEGERKEY`.
 - Reworked/simplified `mdbx_env_sync_internal()`.
 - [Fixed](#248) extra assertion inside `mdbx_cursor_put()` for `MDBX_DUPFIXED` cases.
 - Avoiding extra looping inside `mdbx_env_info_ex()`.
 - Explicitly enabled core dumps from stochastic tests scripts on Linux.
 - [Fixed](#253) `mdbx_override_meta()` to avoid false-positive assertions.
 - For compatibility reverted returning `MDBX_ENODATA`for some cases.

Signed-off-by: Leonid Yuriev <leo@yuriev.ru>

ChangeLog.md

@@ -17,7 +17,7 @@ ChangeLog
  - Packages for [Astra Linux](https://astralinux.ru/), [ALT Linux](https://www.altlinux.org/), [ROSA Linux](https://www.rosalinux.ru/), etc.
 
 
-## v0.11.3 (underway)
+## v0.11.3 at 2021-12-31
 
 Acknowledgements:
 

appveyor.yml

@@ -1,4 +1,4 @@
-version: 0.11.2.{build}
+version: 0.11.3.{build}
 
 environment:
   matrix: