[Snek] Snek version 1.5 release

[Keith Packard]

I've release Snek version 1.5 this afternoon:

 * Arduino Uno port.  This port, is mostly the same as the Duemilanove
   port but includes replacement firmware for the Atmega 16u2 on the Uno
   board which acts as the USB interface.

 * Handle 'chained' comparison operators (a < b < c) correctly.

 * Add sound output support for the Adafruit Circuit Playground
   Express board.

 * Use Optiboot on the Duemilanove board so that Snek can be replaced
   without needing a separate programming device.

-- 
-keith
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