chore: CHANGELOG.md for version 0.13.4 release (#5204)

Author: max-sixty

CHANGELOG.md

@@ -1,16 +1,11 @@
 # PRQL Changelog
 
-## [unreleased]
+## 0.13.4 — 2025-03-26
 
-**Language**:
-
-**Features**:
-
-**Fixes**:
-
-**Documentation**:
+0.13.4 is a small bugfix release.
 
-**Web**:
+It has 57 commits from 10 contributors. Selected changes (in particular, a few
+bugfixes aren't listed here):
 
 **Integrations**:
 
@@ -22,10 +17,6 @@
 - [Neovim](https://neovim.io/) 0.11 has syntax highlighting for PRQL.
   (@vanillajonathan)
 
-**Internal changes**:
-
-**New Contributors**:
-
 ## 0.13.3 — 2025-01-25
 
 0.13.3 is a small release containing a few bug fixes and improvements. It has 86