!55 rc0.2 release notes

Merge pull request !55 from kouzhenzhong/rc0.2_release_notes

RELEASE.md

 ## MindInsight
 
+# Release 0.2.0-alpha
+
+## Major Features and Improvements
+* Parameter distribution graph (Histogram).
+Now you can use [`HistogramSummary`](https://www.mindspore.cn/api/zh-CN/master/api/python/mindspore/mindspore.ops.operations.html#mindspore.ops.operations.HistogramSummary) and MindInsight to record and visualize distribution info of tensors. See our [tutorial](https://www.mindspore.cn/tutorial/zh-CN/master/advanced_use/visualization_tutorials.html) for details.
+* Lineage support Custom information
+* GPU support
+* Model and dataset tracking linkage support
+
+## Bugfixes 
+* Fix graph bug when node name is empty.([#I1EQ5H](https://gitee.com/mindspore/mindinsight/issues/I1EQ5H?from=project-issue))
+* Fix sha256 checksum missing bug.([#I1EHVK](https://gitee.com/mindspore/mindinsight/issues/I1EHVK?from=project-issue))
+* Fix start/stop command exit-code incorrect.([#I1EY3F](https://gitee.com/mindspore/mindinsight/issues/I1EY3F?from=project-issue))
+* Reduce cyclomatic complexity of list_summary_directories.
+([#I1DANB](https://gitee.com/mindspore/mindinsight/issues/I1DANB?from=project-issue))
+* Fix unsafe functions and duplication files and redundant codes.([#I1DDGF]https://gitee.com/mindspore/mindinsight/issues/I1DDGF?from=project-issue))
+
+## Thanks to our Contributors
+Thanks goes to these wonderful people:
+
+Ye Huang, Weifeng Huang, Zhenzhong Kou, Pengting Luo, Hongzhang Li, Yongxiong Liang, Gongchang Ou, Hui Pan, Luyu Qiu, Junyan Qin, Kai Wen, Weining Wang, Yifan Xia, Yunshu Zhang, Ting Zhao
+
+Contributions of any kind are welcome!
+
 # Release 0.1.0-alpha
 
 * Training process observation