Add 0.31.1 changelog (#1473)

Closes #1472

Co-authored-by: Islon Scherer <i_desouzascherer@apple.com>

docs/modules/release-notes/pages/0.31.adoc

@@ -1,6 +1,6 @@
 = Pkl 0.31 Release Notes
 :version: 0.31
-:version-minor: 0.31.0
+:version-minor: 0.31.1
 :release-date: February 26th, 2026
 :version-next: 0.32
 :version-next-date: July 2026

docs/modules/release-notes/pages/changelog.adoc

@@ -1,6 +1,36 @@
 = Changelog
 include::ROOT:partial$component-attributes.adoc[]
 
+[[release-0.31.1]]
+== 0.31.1 (2026-03-26)
+
+=== Breaking Changes [small]#💔#
+
+* Allow nullable reads for custom/external resources (pr:https://github.com/apple/pkl/pull/1471[]).
+
+This allows custom/external resources to produce `null` values for xref:language-reference:index.adoc#nullable-reads[nullable reads] (`read?`).
+While this is a breaking change in behavior, it is currently not possible to exercise with versions of pkl-go or pkl-swift released prior to this change.
+
+=== Fixes
+
+* Fix typo in changelog and language reference (pr:https://github.com/apple/pkl/pull/1455[]).
+* Fix bugs in `CommandSpecParser` (pr:https://github.com/apple/pkl/pull/1448[], pr:https://github.com/apple/pkl/pull/1449[]).
+* Respect `--omit-project-settings` for all evaluator options (pr:https://github.com/apple/pkl/pull/1459[]).
+* Fix SecurityManager check for HTTP(S) module URIs (pr:https://github.com/apple/pkl/pull/1463[]).
+* Fix performance regression caused by activation of power assertion instrumentation during some union type checks (pr:https://github.com/apple/pkl/pull/1462[]).
+* Fix module reflection when power assertion instrumentation is active (pr:https://github.com/apple/pkl/pull/1464[]).
+* Prevent I/O when checking UNC paths against `--root-dir` (pr:https://github.com/apple/pkl/pull/1466[]).
+* Prevent `--multiple-file-output-path` writes from following symlinks outside the target directory
+(pr:https://github.com/apple/pkl/pull/1467[]).
+
+=== Contributors ❤️
+
+Thank you to all the contributors for this release!
+
+* https://github.com/04cb[@04cb]
+* https://github.com/HT154[@HT154]
+* https://github.com/KushalP[@KushalP]
+
 [[release-0.31.0]]
 == 0.31.0 (2026-02-26)
 

jbang-catalog.json

@@ -2,15 +2,15 @@
   "catalogs": {},
   "aliases": {
     "pkl": {
-      "script-ref": "org.pkl-lang:pkl-cli-java:0.31.0",
+      "script-ref": "org.pkl-lang:pkl-cli-java:0.31.1",
       "java-agents": []
     },
     "pkl-codegen-java": {
-      "script-ref": "org.pkl-lang:pkl-codegen-java:0.31.0",
+      "script-ref": "org.pkl-lang:pkl-codegen-java:0.31.1",
       "java-agents": []
     },
     "pkl-codegen-kotlin": {
-      "script-ref": "org.pkl-lang:pkl-codegen-kotlin:0.31.0",
+      "script-ref": "org.pkl-lang:pkl-codegen-kotlin:0.31.1",
       "java-agents": []
     }
   },