using correct namespace for TimedAttempt class

Author: andreagilardoni

examples/timedBlink/timedBlink.ino

@@ -14,7 +14,7 @@
 static int const LED_BUILTIN = 2;
 #endif
 
-TimedAttempt blink(500, 1000);
+tattemp::TimedAttempt blink(500, 1000);
 
 void setup() {
     pinMode(LED_BUILTIN, OUTPUT);