Fixed compiler error (missing assignment operator for class).

include/telebotxx/RequestOptions.hpp

@@ -135,6 +135,9 @@ public:
 	const SwitchInlineQuery& getSwitchInlineQuery() const;
 	const SwitchInlineQueryCurrentChat& getSwitchInlineQueryCurrentChat() const;
 
+	void swap(InlineKeyboardButton&);
+	const InlineKeyboardButton& operator=(InlineKeyboardButton);
+
 private:
 	ActionType actionType_;
 	std::string text_;

src/RequestOptions.cpp

@@ -228,6 +228,20 @@ const SwitchInlineQueryCurrentChat& InlineKeyboardButton::getSwitchInlineQueryCu
 	return boost::get<SwitchInlineQueryCurrentChat>(value_);
 }
 
+void InlineKeyboardButton::swap(InlineKeyboardButton& other)
+{
+	using std::swap;
+	swap(text_, other.text_);
+	swap(actionType_, other.actionType_);
+	swap(value_, other.value_);
+}
+
+const InlineKeyboardButton& InlineKeyboardButton::operator=(InlineKeyboardButton other)
+{
+	swap(other);
+	return *this;
+}
+
 ////////////////////////////////////////////////////////////////
 
 void InlineKeyboardMarkup::addRow(const InlineKeyboardButtonRow& row)