message: fix compile in vec6.h
diff: @@ -294,7 +294,7 @@ public:
  }
  inline std::string toString(const std::string &separator) const {
  - return std::to_string(x) + separator + std::to_string(y) + separator + std::to_string(z) + separator + std::to_string(w) + separator +
  + return std::to_string(x) + separator + std::to_string(y) + separator + std::to_string(z) + separator +
  std::to_string(xx) + separator + std::to_string(yy) + separator + std::to_string(zz);
  }
  