Update cheatsheets

linux/pivpn

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pivpn
+
+> Easy security-hardened OpenVPN setup and manager.
+> Originally designed for the Raspberry Pi, but works on other Linux devices too.
+> More information: <http://www.pivpn.io/>.
+
+- Add a new client device:
+
+`sudo pivpn add`
+
+- List all client devices:
+
+`sudo pivpn list`
+
+- List currently connected devices and their statistics:
+
+`sudo pivpn clients`
+
+- Revoke a previously authenticated device:
+
+`sudo pivpn revoke`
+
+- Uninstall PiVPN:
+
+`sudo pivpn uninstall`