docs(changelog): renew CHANGELOG form

- renew CHANGELOG.md form
- remove CHANGELOG-LINK.md
- add changelog generator

.chglog/CHANGELOG.tpl.md

@@ -0,0 +1,23 @@
+# Changelog
+
+{{ range .Versions }}
+## {{ 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 -}}
+* {{ if .Scope }}**{{ .Scope }}:** {{ end }}{{ .Subject }}
+{{ end }}
+{{ end -}}
+
+{{- if .NoteGroups -}}
+{{ range .NoteGroups -}}
+### {{ .Title }}
+
+{{ range .Notes }}
+{{ .Body }}
+{{ end }}
+{{ end -}}
+{{ end -}}
+{{ end -}}

.chglog/config.yml

@@ -0,0 +1,31 @@
+style: github
+template: CHANGELOG.tpl.md
+info:
+  title: CHANGELOG
+  repository_url: https://github.com/line/cosmwasm
+options:
+  tag_filter_pattern: '^v\d+\.\d+\.\d+-\d+\.\d+\.\d+'
+  commits:
+    filters:
+      Type:
+        - feat
+        - fix
+        - perf
+        - refactor
+        - build
+  commit_groups:
+    title_maps:
+      feat: Features
+      fix: Fixes
+      perf: Improvements
+      refactor: Code Refactoring
+      build: Changes
+  header:
+    pattern: "^(\\w*)(?:\\(([\\w\\$\\.\\-\\*\\s]*)\\))?\\:\\s(.*)$"
+    pattern_maps:
+      - Type
+      - Scope
+      - Subject
+  notes:
+    keywords:
+      - BREAKING CHANGE