Update server_request_parsers_impl.cpp

VC2013 complains that "std::uint8_t" is not defined, it compiles ok after including <cstdint> header.

Author: randydu

libs/network/src/server_request_parsers_impl.cpp

@@ -6,6 +6,8 @@
 
 #include <tuple>
 #include <vector>
+#include <cstdint>
+
 #define BOOST_SPIRIT_UNICODE
 #include <boost/spirit/include/qi.hpp>
 #include <boost/fusion/include/std_tuple.hpp>