Updated CHANGELOG.md with ROCm 6.4.2 changes (#149)

Author: Yiltan

CHANGELOG.md

@@ -29,9 +29,13 @@
 
 * Changed collective APIs to use `_wg` suffix rather than `_wg_` infix
 
+### Resolved Issues
+* Resolved segfault in `rocshmem_wg_ctx_create`, now provides nullptr if ctx cannot be created
+
+## rocSHMEM 2.0.1 for ROCm 6.4.2
+
 ### Resolved Issues
 
 * Resolved incorrect output for `rocshmem_ctx_my_pe` and `rocshmem_ctx_n_pes`
 * Resolved multi-team errors by providing team specific buffers in `rocshmem_ctx_wg_team_sync`
-* Resolved segfault in `rocshmem_wg_ctx_create`, now provides nullptr if ctx cannot be created
 * Resolved missing implementation of `rocshmem_g` for IPC conduit