v1.0.0

Initial release of rustino-stepseq!

The code and circuit have been tested enough for me to say this is ready for you to build and tinker with. I am not an EE and this is my first foray into taking on an embedded project without the help of one (besides, of course, the wonderful contributions of Sam Battle of LOOK MUM NO COMPUTER whose work I have based this on), so it may not be 100% perfect and the schematic may be slightly non-standard.