explicitly import `std::max` from <algorithm> (#2562)

* added <algorithm> to parser header

* reordered inputs per style guide

src/io/parser.cpp

@@ -5,6 +5,7 @@
 #include "parser.hpp"
 
 #include <string>
+#include <algorithm>
 #include <fstream>
 #include <functional>
 #include <iostream>