转移.net core 3.1，为.NET 5做准备

LICENSE

@@ -1,4 +1,4 @@
-                   GNU LESSER GENERAL PUBLIC LICENSE
+                  GNU LESSER GENERAL PUBLIC LICENSE
                        Version 2.1, February 1999
 
  Copyright (C) 1991, 1999 Free Software Foundation, Inc.
@@ -6,9 +6,9 @@
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
-(This is the first released version of the Lesser GPL.  It also counts
+[This is the first released version of the Lesser GPL.  It also counts
  as the successor of the GNU Library Public License, version 2, hence
- the version number 2.1.)
+ the version number 2.1.]
 
                             Preamble
 
@@ -470,8 +470,8 @@ safest to attach them to the start of each source file to most effectively
 convey the exclusion of warranty; and each file should have at least the
 "copyright" line and a pointer to where the full notice is found.
 
-    {description}
-    Copyright (C) 2018 李玉宝
+    <one line to give the library's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
@@ -485,7 +485,8 @@ convey the exclusion of warranty; and each file should have at least the
 
     You should have received a copy of the GNU Lesser General Public
     License along with this library; if not, write to the Free Software
-    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+    USA
 
 Also add information on how to contact you by electronic and paper mail.
 
@@ -494,9 +495,10 @@ school, if any, to sign a "copyright disclaimer" for the library, if
 necessary.  Here is a sample; alter the names:
 
   Yoyodyne, Inc., hereby disclaims all copyright interest in the
-  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+  library `Frob' (a library for tweaking knobs) written by James Random
+  Hacker.
 
-  {signature of Ty Coon}, 1 April 1990
+  <signature of Ty Coon>, 1 April 1990
   Ty Coon, President of Vice
 
 That's all there is to it!