switch to setup for Arduino Boards Manager

digistump-avr/libraries/Digispark_Examples/BT_BLE_Echo/BT_BLE_Echo.ino

@@ -0,0 +1,13 @@
+
+void setup() {                
+  //If prompted for a pairing code it is 1234, 12345, or 000000
+  Serial.begin(9600); 
+}
+
+// the loop routine runs over and over again forever:
+void loop() {
+  if (Serial.available()) {
+    Serial.write(Serial.read());
+  }
+
+}