update readme for updated release

readme.md

@@ -12,8 +12,8 @@ is a general purpose allocator with excellent [performance](#performance) charac
 Initially developed by Daan Leijen for the runtime systems of the
 [Koka](https://koka-lang.github.io) and [Lean](https://github.com/leanprover/lean) languages.
 
-Latest release tag: `v2.1.5` (2024-05-13).  
-Latest v1 tag: `v1.8.5` (2024-05-13).
+Latest release tag: `v2.1.6` (2024-05-13).  
+Latest v1 tag: `v1.8.6` (2024-05-13).
 
 mimalloc is a drop-in replacement for `malloc` and can be used in other programs
 without code changes, for example, on dynamically linked ELF-based systems (Linux, BSD, etc.) you can use it as:
@@ -82,7 +82,7 @@ memory usage
   and fragmentation compared to mimalloc `v1.x` (especially for large workloads). Should otherwise have similar performance
   (see [below](#performance)); please report if you observe any significant performance regression.
 
-* 2024-05-13, `v1.8.5`, `v2.1.5`: Fix build errors on various (older) platforms. Refactored aligned allocation.
+* 2024-05-13, `v1.8.6`, `v2.1.6`: Fix build errors on various (older) platforms. Refactored aligned allocation.
 * 2024-04-22, `v1.8.4`, `v2.1.4`: Fixes various bugs and build issues. Add `MI_LIBC_MUSL` cmake flag for musl builds.
   Free-ing code is refactored into a separate module (`free.c`). Mimalloc page info is simplified with the block size
   directly available (and new `block_size_shift` to improve aligned block free-ing).