Update NEWS file

NEWS

@@ -5,18 +5,26 @@ Glances Version 2.x
 Version 2.1
 ===========
 
+    * Create a max_processes key in the configuration file
+      The goal is to reduce the number of displayed processes in the curses UI and 
+      so limit the CPU footprint of the Glances standalone mode.
+      The API always return all the processes, the key is only active in the curses UI.
+      If the key is not define, all the processes will be displayed.
+      The default value is 20 (processes displayed).
     * History feature (--enable-history option on the command line)
       This feature allows users to generate graphs within the curse interface.
       Graphs are available for CPU, LOAD and MEM.
       To generate graph, click on the 'g' key.
       To reset the history, press the 'r' key.
+      Note: This feature uses the matplotlib library.
     * Alias for network interfaces, disks and sensors
       Users can configure alias from the Glances configuration file.
     * Add Glances log message (in the /tmp/glances.log file)
-      The default log level is INFO, you can switch to the debug mode using the -d option on the command line.
+      The default log level is INFO, you can switch to the DEBUG mode using the -d option on the command line.
     * Add RESTFul API to the web server mode
+      RestFul API doc: https://github.com/nicolargo/glances/wiki/The-Glances-RESTFULL-JSON-API
     * Improve SNMP fallback mode for Cisco IOS, VMware ESXi
-    * Travis coverage
+    * CI: Travis coverage
 
 Bugs corrected: