Updating CHANGELOG.md for ROCm 4.1.0 (#336)

[ROCm/rccl commit: 69c0b44553]
2021-03-25 21:44:24 -06:00
@@ -2,7 +2,7 @@

 Full documentation for RCCL is available at [https://rccl.readthedocs.io](https://rccl.readthedocs.io)

-## [Unreleased]
+## [RCCL-2.7.8 for ROCm 4.1.0]
 ### Added
 - Experimental support for clique-based kernels (opt in with RCCL_ENABLE_CLIQUE=1)
 - Clique-based kernels may offer better performance for smaller input sizes