Add changelog

CHANGELOG.md

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+## 0.4.0
+### Features
+- Custom sidebar
+
+### Bug fixes
+- Fix undefined language
+
+## 0.3.1
+### Bug fixes
+- Strip HTML tag when rendering the headings
+
+## 0.3.0
+### Features
+- Add minified css files
+- Add max level option
+- Add pure.css
+
+## 0.2.1
+### Bug fixes
+- Fix vue.css
+
+## 0.2.0
+### Bug fixes
+- Fix route
+- Remove dynamic title
+
+## 0.1.0
+### Features
+- Add buble.css