Adds the changelog for the forthcoming 2.4 release

Author: simonemainardi

CHANGELOG.md

@@ -1,5 +1,42 @@
 # Changelog
 
+#### ntopng 2.4.0
+
+
+- Fundamental memory-management, stability and speed improvements
+- Security fixes to prevent privileges escalation and XSS
+- Improved alerts with support for
+	- Re-arming
+	- Nagios
+	- Network-based triggers
+	- Suspicious probing attempts
+- Netfilter support with optional packet dropping features
+- Routing visibility through RIPE
+- Hosts/flows listing and grouping facilities implemented directly into the C core rather than in Lua
+- Fine-grained historical data drill-down features in the Professional/Small Business version. Features include top talkers, top applications, and interactions between hosts.
+- Integrations with other tools:
+	- LDAP authentication support
+	- alerts forwarding/withdrawal to Nagios
+	- nBox integration to request pcaps of monitored flows
+	- Apache Kafka flows export
+- Extended and improved traffic *monitoring*:
+	- TCP sessions trhoughput estimations and state breakdown (e.g., established, reset, etc.)
+	- Goodput monitoring
+	- Trends detection
+	- Highligh of low-goodput flows and hosts
+	- Added hosts top-visited sites
+- Built-in support for:
+	- GRE detunnelling
+	- per-VLAN historical statistics
+	- ICMP and ICMPv6 dissection
+- Extended and improved supported OSes: Ubuntu 16, Debian 7, EdgeOS
+- Optional support for hosts categorization via service `flashstart.it`
+- New options:
+	- `--capture-direction` that allows the user to chose which direction to monitor (tx only, rx only, or both)
+	- `--zmq-collector-mode` to assure proper nProbe flow collection  behind firewalls
+	- `--online-license-check` for to check licenses online
+	- `--print-ndpi-protocols` to print nDPI Layer-7 application protocols supported
+
 #### ntopng 2.2.0
 
 - Implementation of **traffic profiles**, logical flow-based aggregations -- e.g., Facebook traffic originating at host X. Real-time statistics as well as historical data are collected for each traffic profile