[SvnBook] #17: update acknowledgements

[SvnBook]

#17: update acknowledgements
----------------------+-----------------------------------------------------
  Reporter:  sussman  |       Owner:  nobody       
      Type:  defect   |      Status:  new          
  Priority:  minor    |   Milestone:  1.5          
 Component:  content  |     Version:  nightly/trunk
Resolution:           |    Keywords:               
----------------------+-----------------------------------------------------
Changes (by sussman):

  * milestone:  1.4 => 1.5

Comment:

 In particular, let's explicitly acknowledge our official 'technical
 reviewers' for both first and second editions.

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Ticket URL: <http://svnbook.red-bean.com/trac/ticket/17#comment:2>
SvnBook <http://svnbook.red-bean.com/>