Updated README.md

gzachos · Jul 16, 2018 · af92684 · af92684
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 This program uses a reed sensor to monitor the status of the door (open/closed)
 and in case of status change an email is send.
 
+## Software
+
+Developed using the [Wiring Pi](http://wiringpi.com/) GPIO interface library.
+
 ## Hardware
 
  - Raspberry Pi 3 Model B Rev 1.2