Add entry to changelog for improved performance of elementwise functions

Author: oleksandr-pavlyk

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Improved performance of copying operation to C-/F-contig array, with optimization for batch of square matrices [gh-1850](https://github.com/IntelPython/dpctl/pull/1850)
 * Improved performance of `tensor.argsort` function for all types [gh-1859](https://github.com/IntelPython/dpctl/pull/1859)
 * Improved performance of `tensor.sort` and `tensor.argsort` for short arrays in the range [16, 64] elements [gh-1866](https://github.com/IntelPython/dpctl/pull/1866)
+* Improved pefrormance of element-wise unary and binary functions [gh-1879](https://github.com/IntelPython/dpctl/pull/1879)
 
 ### Fixed
 * Fix for `tensor.result_type` when all inputs are Python built-in scalars [gh-1877](https://github.com/IntelPython/dpctl/pull/1877)