[v0.01] Update LICENSE and source code extensions

src/common/args.cpp

@@ -3,8 +3,8 @@
 #include <string.h>
 #include <stdlib.h>
 
-#include "args.h"
-#include "global.h"
+#include "args.hpp"
+#include "global.hpp"
 
 struct args_struct {
   bool help_flag;

src/common/global.cpp

@@ -4,7 +4,7 @@
 #include <string.h>
 #include <errno.h>
 
-#include "global.h"
+#include "global.hpp"
 
 #ifdef _WIN32
 

src/common/main.cpp

@@ -2,8 +2,8 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "args.h"
-#include "global.h"
+#include "args.hpp"
+#include "global.hpp"
 
 static const char* VERSION = "0.01";