Correct capitalisation of IPsec

[Raf Czlonka]

Hi all,

A quick diff to correct the capitalisation of IPsec in the main Git
repository[0].

Capitalisation on the website itself[1], will also need changing.

[0] https://git.zx2c4.com/WireGuard/
[1] https://www.wireguard.com/

Regards,

Raf

diff --git a/README.md b/README.md
index 08f8827..b8301e2 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # WireGuard — fast, modern, secure kernel VPN tunnel
 #### by [Jason A. Donenfeld](mailto:Jason at zx2c4.com) of [Edge Security](https://www.edgesecurity.com/)
 
-WireGuard is a novel VPN that runs inside the Linux Kernel and utilizes **state-of-the-art cryptography**. It aims to be faster, simpler, leaner, and more useful than IPSec, while avoiding the massive headache. It intends to be considerably more performant than OpenVPN. WireGuard is designed as a general purpose VPN for running on embedded interfaces and super computers alike, fit for many different circumstances. It runs over UDP.
+WireGuard is a novel VPN that runs inside the Linux Kernel and utilizes **state-of-the-art cryptography**. It aims to be faster, simpler, leaner, and more useful than IPsec, while avoiding the massive headache. It intends to be considerably more performant than OpenVPN. WireGuard is designed as a general purpose VPN for running on embedded interfaces and super computers alike, fit for many different circumstances. It runs over UDP.
 
 **More information may be found at [WireGuard.com](https://www.wireguard.com/).**
 
diff --git a/src/Kconfig b/src/Kconfig
index cc2ba9f..3a68884 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -11,7 +11,7 @@ config WIREGUARD
 	select KERNEL_MODE_NEON if CPU_V7
 	default m
 	help
-	  WireGuard is a secure, fast, and easy to use replacement for IPSec
+	  WireGuard is a secure, fast, and easy to use replacement for IPsec
 	  that uses modern cryptography and clever networking tricks. It's
 	  designed to be fairly general purpose and abstract enough to fit most
 	  use cases, while at the same time remaining extremely simple to