README: Add KRF

Additionally, clean up some trailing whitespace.

README.md

@@ -59,6 +59,10 @@ Additional functions:
 
 ## :hear_no_evil: kernel mode rootkits
 
+- https://github.com/trailofbits/krf
+
+  A kernelspace randomized syscall faulter for Linux 4.15+
+
 - https://github.com/f0rb1dd3n/Reptile :zap: [details](details/reptile.md) :zap:
 
   Reptile is a LKM rootkit written for evil purposes that runs on Linux kernel 2.6.x/3.x/4.x