add CHLOG processing

Signed-off-by: Tim Bray <tbray@textuality.com>

.chglog/CHANGELOG.tpl.md

@@ -0,0 +1,46 @@
+{{ range .Versions }}
+<a name="{{ .Tag.Name }}"></a>
+## {{ if .Tag.Previous }}[Release {{ .Tag.Name }}]({{ $.Info.RepositoryURL }}/compare/{{ .Tag.Previous.Name }}...{{ .Tag.Name }}){{ else }}{{ .Tag.Name }}{{ end }}
+
+> Release Date: {{ datetime "2006-01-02" .Tag.Date }}
+
+{{ range .CommitGroups -}}
+### {{ .Title }}
+
+{{ range .Commits -}}
+- [{{ .Hash.Short }}]{{"\t"}}{{ .Subject }}{{ range .Refs }} (#{{ .Ref }}) {{ end }}
+{{ end }}
+{{ end -}}
+
+{{- if .RevertCommits -}}
+### ⏮ Reverts
+
+{{ range .RevertCommits -}}
+- [{{ .Hash.Short }}]{{"\t"}}{{ .Revert.Header }}{{ range .Refs }} (#{{ .Ref }}) {{ end }}
+{{ end }}
+{{ end -}}
+
+### ⚠️ BREAKING
+
+{{ range .Commits -}}
+{{ if .Notes -}}
+{{ if not .Merge -}}
+{{ if not (contains .Header "Update CHANGELOG for" ) -}}
+{{ .Subject }} [{{ .Hash.Short }}]:{{"\n"}}{{ range .Notes }}{{ .Body }}
+{{ end }}
+{{ end -}}
+{{ end -}}
+{{ end -}}
+{{ end -}}
+
+### 📖 Commits
+
+{{ range .Commits -}}
+{{ if not .Merge -}}
+{{ if not (contains .Header "Update CHANGELOG for" ) -}}
+- [{{ .Hash.Short }}]{{"\t"}}{{ .Header }}{{ range .Refs }} (#{{ .Ref }}) {{ end }}
+{{ end -}}
+{{ end -}}
+{{ end -}}
+
+{{ end -}}

.chglog/config.yml

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+style: github
+template: CHANGELOG.tpl.md
+info:
+  title: CHANGELOG
+  repository_url: https://github.com/timbray/topfew
+options:
+  commits:
+    filters:
+      Type:
+        - chore
+        - fix
+        - kaizen
+        - docs
+  commit_groups:
+    title_maps:
+      chore: 🧹 Chore
+      fix: 🐞 Fix
+      kaizen: 👩‍🎨 Improve
+      docs: 📚 Documentation
+  header:
+    pattern: "^(\\w*)\\:\\s(.*)$"
+    pattern_maps:
+      - Type
+      - Subject
+  refs:
+    actions:
+      - Closes
+      - Fixes
+  notes:
+    keywords:
+      - "BREAKING"