README: switch softether links to https [skip ci]

README.md

@@ -19,7 +19,7 @@
 
 SoftEther VPN (Developer Edition Master Repository)
 - An Open-Source Cross-platform Multi-protocol VPN Program
-http://www.softether.org/
+https://www.softether.org/
 
 
 This repository has experimental codes. Pull requests are welcome.
@@ -29,7 +29,7 @@ https://github.com/SoftEtherVPN/SoftEtherVPN_Stable
 which the non-developer user can stable use.
 
 Source code packages (.zip and .tar.gz) and binary files of Stable Edition are also available:  
-http://www.softether-download.com/
+https://www.softether-download.com/
 
 Copyright (c) all contributors on SoftEther VPN project in GitHub.
 Copyright (c) Daiyuu Nobori, SoftEther Project at University of Tsukuba, and SoftEther Corporation.
@@ -69,7 +69,7 @@ SoftEther VPN supports most of widely-used VPN protocols
 including SSL-VPN, OpenVPN, IPsec, L2TP, MS-SSTP, L2TPv3 and EtherIP
 by the single SoftEther VPN Server program.
 
-More details on http://www.softether.org/.
+More details on https://www.softether.org/.
 
 
 # BOARD MEMBERS OF THIS REPOSITORY
@@ -131,7 +131,7 @@ https://github.com/chipitsine
 - No memory leaks. High quality stable codes, intended for long-term runs.
   We always verify that there are no memory or resource leaks before
   releasing the build.
-- More details at http://www.softether.org/.
+- More details at https://www.softether.org/.
 
 
 # Installation
@@ -174,7 +174,7 @@ Also SoftEther VPN [Stable Edition](https://www.freshports.org/security/softethe
 
 ## From binary installers:
 
-Those can be found under http://www.softether-download.com/
+Those can be found under https://www.softether-download.com/
 There you can also find SoftEtherVPN source code in zip and tar formats.
 
 ## Build from Source code
@@ -263,4 +263,4 @@ Our e-mail address for security reports is:
 
 Please note that the above e-mail address is not a technical support
 inquiry address. If you need technical assistance, please visit
-http://www.softether.org/ and ask your question on the users forum.
+https://www.softether.org/ and ask your question on the users forum.