BloomFilterBuilder.validateSizeInputs should not accept numBits=0 (#725)

Signed-off-by: tison <wander4096@gmail.com>

Author: tisonkun

src/main/java/org/apache/datasketches/filters/bloomfilter/BloomFilterBuilder.java

@@ -235,7 +235,7 @@ private static void validateAccuracyInputs(final long maxDistinctItems, final do
   }
 
   private static void validateSizeInputs(final long numBits, final int numHashes) {
-    if (numBits < 0) {
+    if (numBits <= 0) {
       throw new SketchesArgumentException("Size of BloomFilter must be strictly positive. "
               + "Requested: " + numBits);
     }