Update README.md

Author: GuLinux

README.md

@@ -6,4 +6,4 @@ It is based on ESP32 processors, and provides  web interface for reading power s
 It also reads both ambient temperature/humidity and on scope temperature probes, so it can dynamically regulate the temperature of dew heaters attached to your telescopes.
 
 ## Hardware
-PCB layout: [oshwlab.com/marco.gulino/astropowerbox](https://oshwlab.com/marco.gulino/astropowerbox]
+PCB layout: [oshwlab.com/marco.gulino/astropowerbox](https://oshwlab.com/marco.gulino/astropowerbox)