Use https URL to license text

LICENSE.md

@@ -357,5 +357,5 @@ into proprietary programs. If your program is a subroutine library,
 you may consider it more useful to permit linking proprietary
 applications with the library. If this is what you want to do, use the
 [GNU Lesser General Public
-License](http://www.gnu.org/licenses/lgpl.html) instead of this
+License](https://www.gnu.org/licenses/lgpl.html) instead of this
 License.