Please redesign to static string definition

[sea5kg]

wsjcpp-diff-text/src/wsjcpp_diff_text.cpp

Lines 58 to 60 in 5f9498f

	std::vector<std::string> sWord;
	sWord.push_back("!add");
	sWord.push_back("!del");

static std::string WsjcppDiffTextRow::ADD
static std::string WsjcppDiffTextRow::DEL