add gopsutil to the Miscellaneous section.

README.md

@@ -368,6 +368,7 @@ Join us on IRC at **#awesome-go** on freenode [web access](http://webchat.freeno
 * [autoflags](https://github.com/artyom/autoflags) - Go package to automatically define command line flags from struct fields
 * [browscap_go](https://github.com/fromYukki/browscap_go) - GoLang Library for [Browser Capabilities Project](http://browscap.org/).
 * [xstrings](https://github.com/huandu/xstrings) - A collection of useful string functions ported from other languages.
+* [gopsutil](https://github.com/shirou/gopsutil) - A cross-platform library for retrieving process and system utilization(CPU, Memory, Disks, etc).
 
 ## Natural Language Processing