Prepare Release using 'release-plan'

Author: EisenbergEffect

release-plan-stderr.txt

@@ -0,0 +1,9 @@
+(node:1962) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
+(Use `node --trace-deprecation ...` to show where the warning was created)
+# Unlabeled Changes
+
+* `signal-polyfill`
+  * [#13](https://github.com/proposal-signals/signal-polyfill/pull/13) improve effects example slightly ([@benlesh](https://github.com/benlesh))
+
+
+*Cannot plan release until the above changes are labeled*.