Corrected case in filename of TestMappersOn2Classes.java

This should fix the failed ci build for #2

Author: Martin

enum-mapper-processor/src/test/java/com/tmtron/enums/processor/TestMappersOn2classes.java renamed to enum-mapper-processor/src/test/java/com/tmtron/enums/processor/TestMappersOn2Classes.java

@@ -17,7 +17,7 @@
 
 import org.junit.Test;
 
-public class TestMappersOn2classes extends AnnotationProcessorTest {
+public class TestMappersOn2Classes extends AnnotationProcessorTest {
     @Test
     public void test() throws Exception {
         assertAboutEnumsProcessing(getJfoResource("TwoClasses_Source.java"))