Update CODEOWNERS

Author: shahmishal

CODEOWNERS

@@ -12,10 +12,6 @@
 # E: [email protected]
 # D: Apple, Swift core team
 
-# N: Christopher Thielen
-# E: [email protected]
-# D: Apple
- 
 # N: Mishal Shah
 # E: [email protected]
 # D: Apple, Swift core team
@@ -28,9 +24,9 @@
 
 # The following lines are used by GitHub to automatically recommend reviewers.
 
-* @0xTim @alexandersandberg @daveverwer @dempseyatgithub @parispittman @kaishin @shahmishal @timsneath @federicobucchi
+* @0xTim @alexandersandberg @davelester @daveverwer @dempseyatgithub @kaishin @shahmishal @timsneath @federicobucchi
 
-/_posts/* @timsneath @tkremenek @shahmishal
+/_posts/* @timsneath @tkremenek @shahmishal @davelester
 
 /gsoc*/ @ktoso