Update README.md

- Update links to new Dev Center URLs

Author: ElectricImpSampleCode

ModbusTCPMaster/README.md

@@ -11,13 +11,13 @@ This library allows an imp to communicate with other devices via TCP/IP. It requ
 #require "W5500.device.nut:1.0.0"
 ```
 
-The following instructions are applicable to Electric Imp’s [impAccelerator™ Fieldbus Gateway](https://electricimp.com/docs/hardware/resources/reference-designs/fieldbusgateway/).
+The following instructions are applicable to Electric Imp’s [impAccelerator™ Fieldbus Gateway](https://developer.electricimp.com/hardware/resources/reference-designs/fieldbusgateway).
 
 1. Connect the antenna to the Fieldbus Gateway
 2. Wire RS485 A on the Fieldbus Gateway to port A / positive(+) on the other device
 3. Wire RS485 B on the Fieldbus Gateway to port B / negative(-) on the other device
 4. Wire both devices’ ground ports together
-5. Fit [jumper J2](https://electricimp.com/docs/hardware/resources/reference-designs/fieldbusgateway/#rs-485) on the Fieldbus Gateway motherboard to enable RS485
+5. Fit [jumper J2](https://developer.electricimp.com/hardware/resources/reference-designs/fieldbusgateway#rs-485) on the Fieldbus Gateway motherboard to enable RS485
 6. Power up the Fieldbus Gateway
 7. Configure the Fieldbus Gateway for Internet access using BlinkUp™