Add "Retired" type to "Esplora"

Author: per1234

registry.txt

@@ -5,7 +5,7 @@
 https://github.com/arduino-libraries/Audio.git|Arduino|Audio
 https://github.com/arduino-libraries/AudioZero.git|Arduino|AudioZero
 https://github.com/arduino-libraries/Bridge.git|Arduino|Bridge
-https://github.com/arduino-libraries/Esplora.git|Arduino|Esplora
+https://github.com/arduino-libraries/Esplora.git|Arduino,Retired|Esplora
 https://github.com/arduino-libraries/Ethernet.git|Arduino|Ethernet
 https://github.com/arduino-libraries/GSM.git|Arduino,Retired|GSM
 https://github.com/arduino-libraries/LiquidCrystal.git|Arduino|LiquidCrystal