JOHNZON-422 MapperConverterExceptionsTest fails on Windodws due to wrong line break

There are 2 of those classes

Author: struberg

johnzon-mapper/src/test/java/org/apache/johnzon/mapper/ExceptionAsserts.java

@@ -58,7 +58,7 @@ public ExceptionAsserts assertCauseChain(final Throwable expected) {
     }
 
     public ExceptionAsserts assertMessage(final String expected) {
-        assertEquals(expected, throwable.getMessage());
+        assertEquals(expected.replace("\r\n", "\n"), throwable.getMessage().replace("\r\n", "\n"));
         return this;
     }