Add auto-changelog to generate changelog from commits for each release

changelog.hbs

@@ -0,0 +1,36 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+{{#each releases}}
+  {{#if href}}
+    ## [{{title}}]({{href}}){{#if tag}} - {{isoDate}}{{/if}}
+  {{else}}
+    ## {{title}}{{#if tag}} - {{isoDate}}{{/if}}
+  {{/if}}
+
+  {{#if summary}}
+    {{summary}}
+  {{/if}}
+
+  {{#if merges}}
+    ### Merged
+
+    {{#each merges}}
+      - {{{message}}} {{#if href}}[`#{{id}}`]({{href}}){{/if}}
+    {{/each}}
+  {{/if}}
+
+  {{#if fixes}}
+    ### Fixed
+
+    {{#each fixes}}
+      - {{{commit.subject}}}{{#each fixes}} {{#if href}}[`#{{id}}`]({{href}}){{/if}}{{/each}}
+    {{/each}}
+  {{/if}}
+
+  {{#commit-list commits heading='### Commits'}}
+    - {{#if breaking}}**Breaking change:** {{/if}}{{{subject}}} {{#if href}}[`{{shorthash}}`]({{href}}){{/if}}
+  {{/commit-list}}
+
+{{/each}}

package.json

@@ -10,6 +10,7 @@
     "dev": "npm run build -- --source-maps --watch",
     "start": "node -r source-map-support/register bin/qape.js",
     "preversion": "npm test && npm run docs:build && npm run build",
+    "version": "auto-changelog -t changelog.hbs -p && git add CHANGELOG.md",
     "postversion": "git push origin master && git push --tags && npm publish"
   },
   "bin": {
@@ -33,6 +34,7 @@
     "puppeteer": "1.8.0"
   },
   "devDependencies": {
+    "auto-changelog": "^1.10.1",
     "babel-cli": "6.26.0",
     "babel-plugin-transform-es2015-modules-commonjs": "6.26.2",
     "documentation": "8.1.2",