news: note that otp is supported on mox and more

NEWS

 4.0-alpha3
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+* Added support for Mox OTP (command mox-otp)
 * Fixed LEDs on Omnia (rainbow)
 * SFP on Omnia can be now used by changing used device tree
 * Updater-ng should now require less memory to update system
+* Various packages updates and new Luci theme called Rosy
 
 4.0-alpha2
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