[Chicken-janitors] #857: Update NEWS file to reflect recent changes

[Chicken Trac]

#857: Update NEWS file to reflect recent changes
---------------------------+------------------------------------------------
 Reporter:  felix          |       Owner:       
     Type:  task           |      Status:  new  
 Priority:  critical       |   Milestone:  4.8.0
Component:  documentation  |     Version:  4.7.x
 Keywords:  NEWS           |  
---------------------------+------------------------------------------------
 The `NEWS` file was last updated in commit
 042b576454edfaf820cddc86bc08ede286d0d820, but quite a number of changes
 have been made since then

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Ticket URL: <http://bugs.call-cc.org/ticket/857>
Chicken Scheme <http://www.call-with-current-continuation.org/>
Chicken Scheme is a compiler for the Scheme programming language.