Add codeowners for PYREPL

Author: pablogsal

.github/CODEOWNERS

@@ -43,6 +43,7 @@ Lib/test/test_patma.py        @brandtbucher
 Lib/test/test_type_*.py       @JelleZijlstra
 Lib/test/test_capi/test_misc.py  @markshannon @gvanrossum
 Tools/c-analyzer/             @ericsnowcurrently
+Lib/_pyrepl/*                 @pablogsal @lysnikolaou @ambv
 
 # dbm
 **/*dbm*                      @corona10 @erlend-aasland @serhiy-storchaka