Update README.md

Author: bboyho

README.md

@@ -1,7 +1,7 @@
 SparkFun Unicore GNSS Arduino Library
 ===========================================================
 
-![SparkFun Triband GNSS RTK Breakout - UM980]()
+[![SparkFun Triband GNSS RTK Breakout - UM980](https://cdn.sparkfun.com/r/600-600/assets/parts/2/3/4/8/1/23286-UM980-Triband-GNSS-Breakout-Feature.jpg)](https://www.sparkfun.com/products/23286)
 
 [*SparkFun Triband GNSS RTK Breakout - UM980 (GPS-23286)*](https://www.sparkfun.com/products/23286)