Fixes Checkstyle problems

There are few checkstyles problems found in the  which are required to be fixed

throttling/src/main/java/com/iluwatar/throttling/timer/ThrottleTimerImpl.java

@@ -35,7 +35,7 @@ import com.iluwatar.throttling.CallsCount;
  * @author drastogi
  *
  */
-public class ThrottleTimerImpl implements Throttler{
+public class ThrottleTimerImpl implements Throttler {
 
   private int throttlePeriod;