Remove modcount increment in set method

Author: George Bouroutzoglou

src/main/java/gr/geompokon/bitarray/BitArray.java

@@ -198,7 +198,6 @@ public Boolean get(int index) {
     public Boolean set(int index, Boolean bit) {
         Objects.requireNonNull(bit);
         ensureIndexInRange(index, elements - 1);
-        modCount++;
         // get bit indices
         int longIndex = getLongIndex(index);
         int indexInLong = getIndexInLong(index);