Merge pull request #631 from exercism/collatz-conjecture-update

collatz-conjecture: update to latest tests

exercises/collatz-conjecture/src/test/java/CollatzCalculatorTest.java

 import static org.junit.Assert.assertEquals;
 
 /*
- * version: 1.0.0
+ * version: 1.1.0
  */
 public class CollatzCalculatorTest {
 
 
     @Ignore("Remove to run test")
     @Test
+    public void testAVeryLargeInput() {
+        assertEquals(152, collatzCalculator.computeStepCount(1000000));
+    }
+
+    @Ignore("Remove to run test")
+    @Test
     public void testZeroIsConsideredInvalidInput() {
         expectedException.expect(IllegalArgumentException.class);
         expectedException.expectMessage("Only natural numbers are allowed");