1.18 release updates

Makefile

-export VERSION = 1.17
+export VERSION = 1.18
 
 PKG_CONFIG ?= pkg-config
 

NEWS

+netctl 1.18
+- Move from .include based to drop-in directory based systemd units
+- Allow hooks to alter the profile name
+
 netctl 1.17
 - Add support for UTF-8 encoded SSIDs in wifi-menu
 - Expose the current command (start/stop) to hooks