!63 Update releasenote 1.2.0

From: @anyrenwei
Reviewed-by: @ckey_dou,@gaoxiong1
Signed-off-by: @gaoxiong1

RELEASE.md

@@ -1,9 +1,4 @@
 ## Release 1.2.0
-### Bug fixes
-  * Fixed local memory promotion for large thread (2980!)
-  * Fixed reduce binding dimension issue on gpu platform (ff38!)
-
-## Release 1.2.0-rc1
 ### Major Features and Improvements
   * [STABLE] Rebuild the AKG repository for providing a new way to support ascend backend by linking a static library contained all the ascend passes. (Ascend)
   * [STABLE] Optimize the reduction add operation in ascend backend. (Ascend)
@@ -12,6 +7,8 @@
 ### Bug fixes
   * Fixed a problem that data prefetch cannot be enabled by attributes in DSL.
   * Fixed bugs of autotiling algorithms (tiling too small, cannot adapted matmul+bias, etc.) in Ascend platform.
+  * Fixed local memory promotion for large thread (2980!)
+  * Fixed reduce binding dimension issue on gpu platform (ff38!)
 
 ### Contributors
 Thanks goes to these wonderful people: