Fix bad image link

Author: nseidle

README.md

@@ -5,7 +5,7 @@ SparkFun RTK Firmware
   <tr align="center">
    <td><a href="https://www.sparkfun.com/products/20000"><img src="https://cdn.sparkfun.com//assets/parts/1/9/7/4/6/20000-SparkFun_RTK_Facet_L-Band-01.jpg"></a></td>
    <td><a href="https://www.sparkfun.com/products/19029"><img src="https://cdn.sparkfun.com//assets/parts/1/8/6/3/0/RTK_Facet_Photos-01.jpg"></a></td>
-   <td><a href="https://www.sparkfun.com/products/22429"><img src="https://cdn.sparkfun.com/assets/parts/2/2/5/2/3/SparkFun_GNSS_RTK_Reference_Station_-_05.jpg"></a></td>
+   <td><a href="https://www.sparkfun.com/products/22429"><img src="https://cdn.sparkfun.com//assets/parts/2/2/5/2/3/SparkFun-Reference-Station--05.jpg"></a></td>
   </tr>
   <tr align="center">
     <td><a href="https://www.sparkfun.com/products/20000">SparkFun RTK Facet L-Band (GPS-20000)</a></td>