Roman-numerals: update version file and add test (1.0.0 -> 1.2.0) (#1398)

exercises/roman-numerals/.meta/version

-1.0.0
+1.2.0

exercises/roman-numerals/src/test/java/RomanNumeralsTest.java

         romanNumeral = new RomanNumeral(48);
         assertEquals("XLVIII", romanNumeral.getRomanNumeral());
     }
+    
+    @Ignore("Remove to run test")
+    @Test
+    public void test49ToRomanNumberXLIX() {
+        romanNumeral = new RomanNumeral(49);
+        assertEquals("XLIX", romanNumeral.getRomanNumeral());
+    }
 
     @Ignore("Remove to run test")
     @Test