update changelog

changelog.md

@@ -2,6 +2,11 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.52] - 2023-04-17
+- Changed HTTP requests to reuse TCP connections to improve provisioning time
+- Changed Jinja template code to cache templates on startup
+- Changed the should_provision check timeout to 1h rather than 1 day.
+
 ## [0.51] - 2023-03-08
 - Changed panel selections to use `max` rather than `mean` with `$__interval`