[skipci] add v2.4 changelog

CHANGELOG-2.4.md

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+# CHANGELOG of v2.4
+
+Previous change logs can be found at [CHANGELOG-2.3](https://github.com/opencurve/curve/blob/master/CHANGELOG-2.3.md)
+
+## Notable Changes
+
+- [Update aws-sdk-cpp version to 1.9](https://github.com/opencurve/curve/pull/1780)
+
+- [add feature of warmup](https://github.com/opencurve/curve/pull/1793)
+
+
+## new features
+
+- [CurveFS: implement setxattr interface](https://github.com/opencurve/curve/pull/1935)
+
+- [update aws-sdk-cpp: add ip and custom port support](https://github.com/opencurve/curve/pull/1795)
+
+- [CurveFS client: add s3.useVirtualAddressing config, default value: false](https://github.com/opencurve/curve/pull/1253)
+
+- [Update aws-sdk-cpp version to 1.9](https://github.com/opencurve/curve/pull/1780)
+
+- [add feature of warmup](https://github.com/opencurve/curve/pull/1793)
+
+## optimization
+
+- [CurveFS: update attr and extent in single rpc](https://github.com/opencurve/curve/pull/1784)
+
+- [copyset schedule select copyset random](https://github.com/opencurve/curve/pull/1811)
+
+- [CurveFS: only update dirty inode metadata](https://github.com/opencurve/curve/pull/1853)
+
+
+## bug fix
+
+- [CurveFS:  fix RefreshInode do not refresh when inode exist](https://github.com/opencurve/curve/pull/1800)
+
+- [fix misuse Locked & Unlocked calling contract](https://github.com/opencurve/curve/pull/1279)
+
+- [make callback of s3async request async to avoid deadlock](https://github.com/opencurve/curve/pull/1854)
+
+- [CurveFS :fix update nlink error ](https://github.com/opencurve/curve/pull/1901)
+
+- [CurveFS client: fix umount bug](https://github.com/opencurve/curve/pull/1923)
+
+- [CurveFS client:  fix refresh inode will overwrite data in cache when enabel cto.](https://github.com/opencurve/curve/pull/1993)
+
+