chore: Add release notes for 0.13.1 (#4952)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: max-sixty

CHANGELOG.md

@@ -1,8 +1,12 @@
 # PRQL Changelog
 
-## [unreleased]
+## 0.13.1
 
-**Language**:
+0.13.1 is a small release containing a few bug fixes and improvements. Velocity
+has slowed down a bit in recent months, we're still hoping to finish the new
+resolver and the new formatter in the near future.
+
+It has 97 commits from 10 contributors. Selected changes:
 
 **Features**:
 
@@ -26,14 +30,6 @@
 - A few more keywords are quoted, such as `user`, which is a reserved keyword in
   PostgreSQL. (@max-sixty)
 
-**Documentation**:
-
-**Web**:
-
-**Integrations**:
-
-**Internal changes**:
-
 **New Contributors**:
 
 ## 0.13.0 — 2024-07-25

README.md

@@ -64,7 +64,7 @@ For more on the language, more examples & comparisons with SQL, visit
 [prql-lang.org][prql website]. To experiment with PRQL in the browser, check out
 [PRQL Playground][prql playground].
 
-## Current Status - June 2024
+## Current Status - October 2024
 
 PRQL is being actively developed by a growing community. It's ready to use by
 the intrepid, either with our supported integrations, or within your own tools,