easylogging++: Print thread ID in a nicer way

external/easylogging++/easylogging++.h

@@ -363,6 +363,7 @@ ELPP_INTERNAL_DEBUGGING_OUT_INFO << ELPP_INTERNAL_DEBUGGING_MSG(internalInfoStre
 #include <fstream>
 #include <iostream>
 #include <sstream>
+#include <iomanip>
 #include <memory>
 #include <type_traits>
 #if ELPP_THREADING_ENABLED
@@ -1079,7 +1080,7 @@ namespace el {
                                 /// @brief Gets ID of currently running threading using std::this_thread::get_id()
                                 static inline std::string getCurrentThreadId(void) {
                                     std::stringstream ss;
-                                    ss << std::this_thread::get_id();
+                                    ss << std::setfill(' ') << std::setw(16) << std::hex << std::this_thread::get_id();
                                     return ss.str();
                                 }
                                 static inline void msleep(int ms) {