Method writeStylesheetRef

tests/include/catch.hpp:15729–15731

    }

    void XmlWriter::writeStylesheetRef( std::string const& url ) {
        m_os << "<?xml-stylesheet type=\"text/xsl\" href=\"" << url << "\"?>\n";
    }

    XmlWriter& XmlWriter::writeBlankLine() {
        ensureTagClosed();