docs: Document Check.context type change

Check contexts must now be slugs. Document this in the release notes.

Signed-off-by: Stephen Finucane <stephen@that.guru>

diff --git a/releasenotes/notes/slugify-check-context-dc586f204b5058a7.yaml b/releasenotes/notes/slugify-check-context-dc586f204b5058a7.yaml
new file mode 100644 (file)
index 0000000..4930325
--- /dev/null
+++ b/releasenotes/notes/slugify-check-context-dc586f204b5058a7.yaml
@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    The ``context`` field for patch checks must now be slug, or a string
+    consisting of only ASCII letters, numbers, underscores or hyphens. While
+    older, non-slugified strings won't cause issues, any scripts creating
+    contexts must be updated where necessary.