Update CODEOWNERS

Author: warsaw

.github/CODEOWNERS

@@ -687,7 +687,7 @@ peps/pep-0808.rst  @FFY00
 peps/pep-0809.rst  @zooba
 peps/pep-0810.rst  @pablogsal @DinoV @Yhg1s
 peps/pep-0811.rst  @sethmlarson @gpshead
-peps/pep-0813.rst  @warsaw
+peps/pep-0813.rst  @warsaw @ericvsmith
 peps/pep-0814.rst  @vstinner @corona10
 # ...
 peps/pep-2026.rst  @hugovk