📦 Add release.yml

I noticed that rdoc and irb have a release.yml.  This is slightly
different from theirs.  It has all of the categories that I've been
using for recent releases.  It does not add emojis to the category
titles, because that seems redundant with emojis for individual PRs.

.github/release.yml

@@ -0,0 +1,26 @@
+changelog:
+  exclude:
+    labels:
+      - ignore-for-release
+  categories:
+    - title: Breaking Changes
+      labels: ["breaking-change"]
+    - title: Added
+      labels: ["enhancement"]
+    - title: Deprecated
+      labels: ["deprecation"]
+    - title: Fixed
+      labels: ["bug"]
+    - title: Documentation
+      labels: ["documentation"]
+    - title: Other Changes
+      labels: ["*"]
+      exclude:
+        labels:
+          - "tests-only"
+          - "dependencies"
+          - "workflows"
+        authors:
+          - "dependabot"
+    - title: Miscellaneous
+      labels: ["*"]