Bael 1010 hll (#2256)

* BAEL-1010 HLL article code

* BAEL-1010 moved tolerated difference to a variable

* Merge branch 'master' of https://github.com/eugenp/tutorials into BAEL-1010_hll

# Conflicts:
#	libraries/pom.xml

* BAEL-1010 clearer code

libraries/src/test/java/com/baeldung/hll/HLLUnitTest.java

@@ -57,7 +57,8 @@ public class HLLUnitTest {
         //then
         firstHll.union(secondHLL);
         long cardinality = firstHll.cardinality();
-        assertThat(isSimilarTo(cardinality, numberOfElements * 2, toleratedDifference)).isTrue();
+        assertThat(isSimilarTo(cardinality, numberOfElements * 2,
+                toleratedDifference * 2)).isTrue();
     }
 
     private boolean isSimilarTo(long cardinality, int numberOfElements, int maxToleratedDifference) {