rename & restore sponsor

Author: skirpichev

.github/CODEOWNERS

@@ -688,7 +688,7 @@ 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-0812.rst
+peps/pep-0812.rst  @serhiy-storchaka
 peps/pep-0813.rst  @warsaw @ericvsmith
 peps/pep-0814.rst  @vstinner @corona10
 peps/pep-0815.rst  @emmatyping

peps/pep-9999.rst peps/pep-0812.rstpeps/pep-9999.rst renamed to peps/pep-0812.rst

@@ -1,7 +1,7 @@
-PEP: 9999
+PEP: 812
 Title: Imaginary type and IEC 60559-compatible complex arithmetic
 Author: Sergey B Kirpichev <skirpichev@gmail.com>
-Sponsor: Pending
+Sponsor: Serhiy Storchaka <storchaka@gmail.com>
 Discussions-To: Pending
 Status: Draft
 Type: Standards Track