Attempt to automate hex publish

.github/workflows/release.yml

@@ -0,0 +1,17 @@
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  publish:
+    if: "github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/v')"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out
+        uses: actions/checkout@v2
+
+      - name: Publish to Hex.pm
+        uses: erlangpack/github-action@v1
+        env:
+          HEX_API_KEY: ${{ secrets.HEX_API_KEY }}

CHANGES.md

@@ -1,4 +1,4 @@
-Version 2.22.0 released XXXX-XX-XX
+Version 2.22.0 released 2021-08-23
 
 * Renamed master branch to main
 * Add unquote_path/1 for separate '+' encoding