修正代码中的注释错误

tem3dfdtd/module/electromagnetic-variables.f90

@@ -1,6 +1,6 @@
-!Copyright (c) 2013 by tdem.org under guide of Xiu Li(lixiu@chd.edu.cn)
-!written by Huaifeng Sun(sunhuaifeng@gmail.com) and Xushan Lu(luxushan@gmail.com)
-!Code distribution @ tdem.org or sunhuaifeng.com
+!Copyright (c) 2013 by https://git.em3d.cn/ under guide of Xiu Li(lixiu@chd.edu.cn)
+!written by Huaifeng Sun(sunhuaifeng@email.sdu.edu.cn) and Xushan Lu(luxushan@gmail.com)
+!Code distribution @ https://git.em3d.cn/
 
 MODULE ELECTROMAGNETIC_VARIABLES
   REAL(KIND=8), DIMENSION(:,:,:), ALLOCATABLE:: EX,EY,EZ    !The x,y and z component of electric field in 3 dimensions