docs: Add CHANGELOG

.chglog/CHANGELOG.tpl.md

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+{{range .Versions}}
+<a name="{{.Tag.Name}}"></a>
+## {{if .Tag.Previous}}[{{.Tag.Name}}]({{$.Info.RepositoryURL}}/compare/{{.Tag.Previous.Name}}...{{.Tag.Name}}){{else}}{{.Tag.Name}}{{end}} ({{datetime "2006-01-02" .Tag.Date}})
+{{range .CommitGroups}}
+### {{.Title}}
+{{range .Commits}}
+* {{.Subject}}{{end}}
+{{end}}{{if .RevertCommits}}
+### Reverts
+{{range .RevertCommits}}
+* {{.Header}}{{end}}
+{{end}}{{if .MergeCommits}}
+### Pull Requests
+{{range .MergeCommits}}
+* {{.Header}}{{end}}
+{{end}}{{range .NoteGroups}}
+### {{.Title}}
+{{range .Notes}}
+{{.Body}}
+{{end}}
+{{end}}
+{{end}}

.chglog/config.yml

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+style: github
+template: CHANGELOG.tpl.md
+info:
+  title: CHANGELOG
+  repository_url: https://github.com/git-chglog/git-chglog
+options:
+  commits:
+    filters:
+      Type:
+        - feat
+        - fix
+        - perf
+        - refactor
+  commit_groups:
+    title_maps:
+      feat: Features
+      fix: Bug Fixes
+      perf: Performance Improvements
+      refactor: Code Refactoring
+  header:
+    pattern: "^(\\w*)\\:\\s(.*)$"
+    pattern_maps:
+      - Type
+      - Subject
+  notes:
+    keywords:
+      - BREAKING CHANGE

CHANGELOG.md

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+# CHANGELOG
+
+<a name="0.0.1"></a>
+## 0.0.1 (2018-02-18)
+
+First release :tada: