Add chris and erich to pairs

Author: Chris Hendrix and Erich Douglass

.pairs

@@ -24,6 +24,8 @@ pairs:
   tg: Travis Grathwell
   yt: Yulia Tolskaya; ytolskaya
   tj: Tim Jarratt; tjarratt
+  ed: Erich Douglass; edouglass
+  ch: Chris Hendrix; chendrix
 email:
   prefix: pair
   domain: pivotallabs.com