Remove nginx failure note now that it works

Updates google#1

PiperOrigin-RevId: 201760129
Change-Id: Ifd8ce9e0f93c6771083dc9bf8d35a2800c13481a

Author: prattmic

README.md

@@ -373,6 +373,7 @@ The following applications/images have been tested:
 * memcached
 * mongo
 * mysql
+* nginx
 * node
 * php
 * postgres
@@ -389,8 +390,6 @@ The following applications have been tested and may not yet work:
 
 * elasticsearch: Requires unimplemented socket ioctls. See [bug
   #2](https://github.com/google/gvisor/issues/2).
-* nginx: Requires `ioctl(FIOASYNC)`, but see workaround in [bug
-  #1](https://github.com/google/gvisor/issues/1).
 
 ### Will my container work with gVisor?