add CHANGELOG-1.2.md

Change-Id: I80f310fd5b6190034fe437c74701ded62991d638

CHANGELOG-1.2.md

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+# CHANGELOG of v1.2
+
+Previous change logs can be found at [CHANGELOG-1.1](https://github.com/opencurve/curve/blob/master/CHANGELOG-1.1.md)
+
+## new features
+
+- [When add a new pool, default new logic pool is DENY, need tool to enable it.](https://github.com/opencurve/curve/pull/221)
+- [When io error occurs, whether nebd-server discards the corresponding rpc request depends on configuration setting(discard default).](https://github.com/opencurve/curve/pull/212)
+- [When client read a unallocated space, it does not allocate the segment to improve the space utilization.](https://github.com/opencurve/curve/pull/172)
+- [Add data stripe feature.](https://github.com/opencurve/curve/pull/211)
+
+
+## optimization
+
+- Optimize ansible script, optimize build script, optimize log printing.
+- Translate some document and code comment from chinese to english.
+- [Curve_ops_tool statistics chunkserver capacity by pool.](https://github.com/opencurve/curve/pull/199)
+- Add a script for k8s to attach curve volume.
+- curve_ops_tool improve:
+    - [Check copyset consistency between chunkserver and copyset.](https://github.com/opencurve/curve/pull/184)
+    - [Support to take a snapshot of copyset.](https://github.com/opencurve/curve/pull/188)
+    - [Support to list the volume on copyset where majority copy is failed.](https://github.com/opencurve/curve/pull/233)
+- [Clean up the unit test temporary folder.](https://github.com/opencurve/curve/pull/206/)
+
+## bug fix
+
+- [Fix clone delete bug.](https://github.com/opencurve/curve/pull/176)
+- [Nbd unmap need wait thread exit.](https://github.com/opencurve/curve/pull/228)
+- [Mds need check file attach status.](https://github.com/opencurve/curve/pull/153)
+- [Fixed when disk fails, copyset reports an error, but sometimes the chunkserver does not exit.](https://github.com/opencurve/curve/pull/152)
+- [Fixed the direct_fd leak problem when wal write disk.](https://github.com/opencurve/curve/pull/113)
+- [Fixed the atomicity problem of GetFile when not using the file pool.](https://github.com/opencurve/curve/pull/195)
+- [Fixed in cluster_basic_test mds start error on InitEtcdClient() which produced coredump](https://github.com/opencurve/curve/pull/205)