#1374 extend ssl setup instruction for the hardware

README.md

@@ -314,7 +314,8 @@ Available server options:
         server.ssl.cert=./server_embedded.crt
         server.ssl.key=./server_embedded.pem
         server.ssl.key.pass=pupkin123
-        
+
+**Note**: if you use Let's Encrypt certificates you'll have to add ```#define BLYNK_SSL_USE_LETSENCRYPT``` before ```#include <BlynkSimpleEsp8266_SSL.h>``` in the Arduino Sketch for your hardware.
         
 + User profiles folder. Folder in which all users profiles will be stored. By default System.getProperty("java.io.tmpdir")/blynk used. Will be created if not exists