Changed John to Jessica in Forked public project

$ git request-pull origin/master myfork should produce commits by Jessica and not by John. Fixed the first appearence of John.

Author: Snehal Shekatkar

book/05-distributed-git/sections/contributing.asc

@@ -554,7 +554,7 @@ For instance, if Jessica wants to send John a pull request, and she's done two c
 ----
 $ git request-pull origin/master myfork
 The following changes since commit 1edee6b1d61823a2de3b09c160d7080b8d1b3a40:
-  John Smith (1):
+Jessica Smith (1):
         added a new function
 
 are available in the git repository at: