PEP 798: Unpacking in Comprehensions (#4498)

Author: adqm

.github/CODEOWNERS

@@ -673,6 +673,7 @@ peps/pep-0791.rst  @vstinner
 peps/pep-0792.rst  @dstufft
 peps/pep-0793.rst  @encukou
 peps/pep-0794.rst  @brettcannon
+peps/pep-0798.rst  @JelleZijlstra
 # ...
 peps/pep-0801.rst  @warsaw
 # ...