Bump HIP version to 1.4 and update release notes

Change-Id: I3570dedb32fe5fec6f60565c587a3282a4c6c709


[ROCm/hip commit: ca239ab6ef]

projects/hip/RELEASE.md

@@ -8,6 +8,17 @@ We have attempted to document known bugs and limitations - in particular the [HI
 
 ## Revision History:
 
+===================================================================================================
+Release: 1.4
+Date: 2017.10.06
+- Improvements to HIP event management
+- Added new HIP_TRACE_API options
+- Enabled device side assert support
+- Several bug fixes including hipMallocArray, hipTexture fetch
+- Support for RHEL/CentOS 7.4
+- Updates to hipify-perl, hipify-clang and documentation
+
+
 ===================================================================================================
 Release: 1.3
 Date: 2017.08.16