update readme for release

doc/spec/news.mdk

@@ -5,6 +5,9 @@ News:
   "_Programming with Effect Handlers and FBIP in Koka_" is now available on 
   [youtube](https://www.youtube.com/watch?v=6OFhD_mHtKA).
 
+* 2021-12-27: Koka v2.3.8 released: improved `int` performance, various bug fixes, update wasm backend, 
+  initial conan support, fix js backend.
+
 * 2021-11-26: Koka v2.3.6 released: 
   `maybe`-like types are already value types, but now also no longer need heap allocation 
   if not nested (and `[Just(1)]` uses the same heap space as `[1]`),

readme.md

@@ -10,7 +10,7 @@
 # Koka: a Functional Language with Effects
 
 _Koka v2 is a research language that currently under heavy development with the new C backend_  
-_Latest release_: v2.3.6, 2021-11-26 ([Install]).
+_Latest release_: v2.3.8, 2021-12-27 ([Install]).
 
 <a href="https://koka-lang.github.io/koka/doc/book.html#why-handlers"><img align="right" width="300" src="doc/snippet-yield.png" /></a>
 
@@ -62,7 +62,7 @@ To learn more:
 [Perceus]: https://www.microsoft.com/en-us/research/publication/perceus-garbage-free-reference-counting-with-reuse/
 [vsprompt]: https://docs.microsoft.com/en-us/cpp/build/how-to-enable-a-64-bit-visual-cpp-toolset-on-the-command-line?view=vs-2019
 [winclang]: https://llvm.org/builds
-[vcpkg]: https://github.com/microsoft/vcpkg#getting-started
+[vcpkg]: https://vcpkg.io/en/getting-started.html
 [ghcup]: https://www.haskell.org/ghcup
 [nobrace]: https://koka-lang.github.io/koka/doc/book.html#sec-layout
 [m1arch]: https://cpufun.substack.com/p/setting-up-the-apple-m1-for-native
@@ -81,6 +81,8 @@ and all previous interns working on earlier versions of Koka: Daniel Hillerströ
 
 ## Recent Releases
 
+- `v2.3.8`, 2021-12-27: improved `int` performance, various bug fixes, update wasm backend, 
+  initial conan support, fix js backend.
 - `v2.3.6`, 2021-11-26: fix specialization bug, add `std/os/readline` module.
 - `v2.3.4`, 2021-11-26: `maybe`-like types are already value types, but now also no longer need heap allocation 
   if not nested (and `[Just(1)]` uses the same heap space as `[1]`),
@@ -107,19 +109,7 @@ and all previous interns working on earlier versions of Koka: Daniel Hillerströ
 - `v2.2.0`, 2021-08-26: improved case-of-known simpification (by Rakshika B), improve cross-module specialization
   (by Steven Fontanella), initial borrowing annotations and improved reuse analysis (by Anton Lorenzen),
   improved line editing in the interactive environment, improved inlining. Note: due to the new inline phases,
-  effect handling may currently be a tad slower in this release but will be improved for the next release.
-- `v2.1.9`, 2021-06-23: initial support for cross-module specialization (by Steven Fontanella).
-- `v2.1.8`, 2021-06-17: initial support for macOS M1 and Linux arm64, improved readline, minor fixes.
-- `v2.1.6`, 2021-06-10: initial support for shallow resumptions, fix space leak with vectors, allow `gcc` with `--fasan`,
-  improved `vcpkg` support, add `--fstdalloc` flag, improved VS code syntax highlighting, improved `valgrind` support,
-  added `--no-optimize` flag for extended debug information.
-- `v2.1.4`, 2021-05-31: remove dependency on cmake, support library linking, support vckpg, updated `std/text/regex`,
-  improved Windows installer with `clang` install included, remove dependency on Visual Studio on Windows,
-  improved `--fasan` support, fixed space leak on boxed value types, use signed `size_t` internally, various small bug fixes.
-- `v2.1.2`, 2021-05-01: various bug fixes, allow pattern bindings in parameters of anonymous functions (by Steven Fontanella),
-  initial Emacs syntax highlighting (by Kamoii).
-- `v2.1.1`, 2021-03-08: bug fixes, use right-associative (++) for string- and list append (instead of (+)), improved internal 
-  string handling.
+  effect handling may currently be a tad slower in this release but will be improved for the next release.  
 - [Older release notes](#older-release-notes).
 
 <!--
@@ -439,6 +429,18 @@ info: elapsed: 1.483s, user: 1.484s, sys: 0.000s, rss: 164mb
 
 ## Older Release Notes
 
+- `v2.1.9`, 2021-06-23: initial support for cross-module specialization (by Steven Fontanella).
+- `v2.1.8`, 2021-06-17: initial support for macOS M1 and Linux arm64, improved readline, minor fixes.
+- `v2.1.6`, 2021-06-10: initial support for shallow resumptions, fix space leak with vectors, allow `gcc` with `--fasan`,
+  improved `vcpkg` support, add `--fstdalloc` flag, improved VS code syntax highlighting, improved `valgrind` support,
+  added `--no-optimize` flag for extended debug information.
+- `v2.1.4`, 2021-05-31: remove dependency on cmake, support library linking, support vckpg, updated `std/text/regex`,
+  improved Windows installer with `clang` install included, remove dependency on Visual Studio on Windows,
+  improved `--fasan` support, fixed space leak on boxed value types, use signed `size_t` internally, various small bug fixes.
+- `v2.1.2`, 2021-05-01: various bug fixes, allow pattern bindings in parameters of anonymous functions (by Steven Fontanella),
+  initial Emacs syntax highlighting (by Kamoii).
+- `v2.1.1`, 2021-03-08: bug fixes, use right-associative (++) for string- and list append (instead of (+)), improved internal 
+  string handling.
 - `v2.0.16`, 2021-02-14: bug fixes, fix short-circuit evaluation of logical operations, improved utf-8 handling.
 - `v2.0.14`, 2020-12-11: bug fixes, improved var escape checking.
 - `v2.0.12`, 2020-12-02: syntax highlighting support for VS Code and Atom, improved uninstall, more samples.