fix typo in Example1 restore

Author: oclyke

libraries/RTC/examples/Example1_Get_Time/Example1_Get_Time.ino

@@ -38,7 +38,7 @@ void loop()
   Serial.printf("%02d.", myRTC.seconds);
   Serial.printf("%02d", myRTC.hundredths);
 
-  Serial.printf(" 20%d/", myRTC.month);
+  Serial.printf(" %02d/", myRTC.month);
   Serial.printf("%02d/", myRTC.dayOfMonth);
   Serial.printf("%02d", myRTC.year);