release: update NEWS

NEWS

 ======================================================
-network-manager-applet-1.7.1
+network-manager-applet-1.8
 Overview of changes since network-manager-applet-1.4.6
 ======================================================
 
-This is a development snapshot of network-manager-applet 1.8 series.
-USE AT YOUR OWN RISK.  NOT RECOMMENDED FOR PRODUCTION USE!
-
-Notable changes included in this snapshot so far include:
+This is a new stable release of network-manager-applet.  Notable changes include:
 
 * Warn editor users if certificates have wrong SELinux labels
 * Added a PKCS#11 capable certificate chooser to EAP-TLS
+* Request Wi-Fi scan when showing the menu and update the scan
+    result list dynamically.
 * Prevent the use from opening a file open dialog if they don't have
     permission to edit connections (e.g. in the login manager session)
     (CVE-2017-6590)
+* Fix broken libnma's pygobject library
+* Add version macros to libnma.
 
 ======================================================
 network-manager-applet-1.4.6