doc: switch links to https

These sites offer https versions of their content.
Using the https versions provides some protection for users.

Signed-off-by: Josh Soref <jsoref@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/list.h b/list.h
index 362a4cd7f5..98428010f4 100644
--- a/list.h
+++ b/list.h
@@ -19,7 +19,7 @@
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see
- * <http://www.gnu.org/licenses/>.
+ * <https://www.gnu.org/licenses/>.
  */
 
 #ifndef LIST_H