Update docs

- Update README and IKEv2 docs for Libreswan 3.26

README-zh.md

@@ -168,8 +168,6 @@ wget https://git.io/vpnupgrade -O vpnupgrade.sh
 wget https://git.io/vpnupgrade-centos -O vpnupgrade.sh
 ```
 
-:warning: VPN 脚本默认安装 Libreswan 3.22，因为新版本 3.23 和 3.25 存在问题，从而不能同时连接在同一个 NAT （比如家用路由器）后面的多个 IPsec/XAuth VPN 客户端。
-
 ## 问题和反馈
 
 - 有问题需要提问？请先搜索已有的留言，在 <a href="https://gist.github.com/hwdsl2/9030462#comments" target="_blank">这个 Gist</a> 以及 <a href="https://blog.ls20.com/ipsec-l2tp-vpn-auto-setup-for-ubuntu-12-04-on-amazon-ec2/#disqus_thread" target="_blank">我的博客</a>。

README.md

@@ -168,8 +168,6 @@ wget https://git.io/vpnupgrade -O vpnupgrade.sh
 wget https://git.io/vpnupgrade-centos -O vpnupgrade.sh
 ```
 
-:warning: The VPN scripts install Libreswan 3.22 by default, because newer versions 3.23 and 3.25 have issues with connecting multiple IPsec/XAuth VPN clients from behind the same NAT (e.g. home router).
-
 ## Bugs & Questions
 
 - Got a question? Please first search other people's comments <a href="https://gist.github.com/hwdsl2/9030462#comments" target="_blank">in this Gist</a> and <a href="https://blog.ls20.com/ipsec-l2tp-vpn-auto-setup-for-ubuntu-12-04-on-amazon-ec2/#disqus_thread" target="_blank">on my blog</a>.

docs/ikev2-howto-zh.md

@@ -60,6 +60,15 @@ Libreswan 支持通过使用 RSA 签名算法的 X.509 Machine Certificates 来
    $ ipsec --version
    ```
 
+   如果是 Libreswan 3.23 或更新版本：
+
+   ```bash
+   $ cat >> /etc/ipsec.conf <<EOF
+     modecfgdns="8.8.8.8, 8.8.4.4"
+     encapsulation=yes
+   EOF
+   ```
+
    如果是 Libreswan 3.19-3.22：
 
    ```bash
@@ -70,15 +79,6 @@ Libreswan 支持通过使用 RSA 签名算法的 X.509 Machine Certificates 来
    EOF
    ```
 
-   如果是 Libreswan 3.23 或更新版本：
-
-   ```bash
-   $ cat >> /etc/ipsec.conf <<EOF
-     modecfgdns="8.8.8.8, 8.8.4.4"
-     encapsulation=yes
-   EOF
-   ```
-
    如果是 Libreswan 3.18 或更早版本：
 
    ```bash

docs/ikev2-howto.md

@@ -60,6 +60,15 @@ Before continuing, make sure you have successfully <a href="https://github.com/h
    $ ipsec --version
    ```
 
+   For Libreswan 3.23 and newer:
+
+   ```bash
+   $ cat >> /etc/ipsec.conf <<EOF
+     modecfgdns="8.8.8.8, 8.8.4.4"
+     encapsulation=yes
+   EOF
+   ```
+
    For Libreswan 3.19-3.22:
 
    ```bash
@@ -70,15 +79,6 @@ Before continuing, make sure you have successfully <a href="https://github.com/h
    EOF
    ```
 
-   For Libreswan 3.23 and newer:
-
-   ```bash
-   $ cat >> /etc/ipsec.conf <<EOF
-     modecfgdns="8.8.8.8, 8.8.4.4"
-     encapsulation=yes
-   EOF
-   ```
-
    For Libreswan 3.18 and older:
 
    ```bash