Put 'last' breaks trailer comments #90

    @Test
    void testPutLastLine() throws IOException {
        final String given = "key=val\n"
                + "# trailer comment";
        final String expected = "key=val\n"
                + "# trailer comment\n"
                + "\n"
                + "put=putVal";

        Properties p = Properties.loadProperties(new StringReader(given));
        p.put(p.last().next(), "put", "putVal");
        expectStoreText(p, expected);
    }