Add change log.

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+# Change log
+
+## Mark 3: ???
+
+* Initial circuit board design in KiCAD + Racket.
+* Assembly guide updated to include wood finishing.
+* Cable hole in case spacer has rounded edges.
+* New layout: multidvorak.
+* Switch to Pololu A-Star Micro controller. (also USB mini->micro)
+
+## NX-02: 2014-08-05
+
+* Experimental prototype.
+* Matias Quiet Click switches.
+* Teensy 3: ARM-based microcontroller.
+* Orestes: firmware written in Forth.
+
+## Mark 2: 2014-04-22
+
+* New openscad case design by Constantine.
+* New layouts: hardware dvorak, hardware colemak.
+* Assembly guide.
+
+## Mark 1: 2014-04-01
+
+* Custom Atreus firmware in C.
+* New layout with digits in numpad arrangement.
+* Add layer for function keys and arrows.
+
+## NX-01: 2014-02-22
+
+* Initial prototype!
+* Uses TMK firmware.