Merge pull request #1 from Ruudieboy/fix_unit_test

Fix Predicate unit test

Author: JosePaumard

src/test/java/org/paumard/lambdamasterclass/part1/Test02_Predicate.java

@@ -32,7 +32,7 @@ public void predicate_1() {
     @Test
     public void predicate_2() {
         Predicate<String> p1 = s -> s != null;
-        Predicate<String> p2 = s -> s.isEmpty();
+        Predicate<String> p2 = s -> !s.isEmpty();
 
         Predicate<String> p3 = null; // TODO