Add CHANGELOG.md

Author: Hyunje Jun

CHANGELOG.md

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+## 1.1.0 (31 May 2017)
+
+* Handle pre-parsed body (string and buffer only)
+
+Type
+
+* Separate config type into client and middleware types
+* Add `userId` to group and room event sources
+
+Misc
+
+* Create issue template (#4)
+
+## 1.0.0 (11 May 2017)
+
+* Initial release