Update readme.md

2018-03-13 19:34:11 -10:00 · 2018-03-13 19:34:11 -10:00 · 8ab25183e4
Commit 8ab25183e4
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 More info here:

-http://www.40percent.club/2018/03/happy_pi_day.html
+http://www.40percent.club/2018/03/happy-pi-day.html

 [How to order PCBs from gerber files](http://www.40percent.club/2017/03/ordering-pcb.html)