Add CHANGELOG.md

CHANGELOG.md

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+# 1.4.0
+
+  * Propagate WouldBlock in io:Error for Response::to_json.
+  * Merge multiple cookies into one header to be spec compliant.
+  * Allow setting TLSConnector for native-tls.
+  * Remove brackets against TLS lib when IPv6 addr is used as hostname.
+  * Include proxy in connection pool keys.
+  * Stop assuming localhost for URLs without host part.
+  * Error if body length is less than content-length.
+  * Validate header names.
+
+# 1.3.0
+
+  * Changelog start