Added list of supported platforms
Added list of supported platforms

peterpolidoro/ArduinoJson,bblanchon/ArduinoJson,janelia-arduino/ArduinoJson,peterpolidoro/ArduinoJson,hemantsangwan/Arduino-Json,janelia-arduino/ArduinoJson,peterpolidoro/ArduinoJson,janelia-arduino/ArduinoJson,hemantsangwan/Arduino-Json,peterpolidoro/ArduinoJson,bblanchon/ArduinoJson,bblanchon/ArduinoJson,janelia-arduino/ArduinoJson,hemantsangwan/Arduino-Json