Updated ChangeLog for release 2.0

Change-Id: Ib61ae8901736d157e3b89d54194010d44bca8f20

ChangeLog

@@ -1,3 +1,28 @@
+=======================================================================
+Release  v2.0  ...
+=======================================================================
+
+Contributors (alphabetical order):
+        Colin Ian King <[email protected]>
+        David Williams <[email protected]>
+        Marcel Cornu <[email protected]>
+        Mateusz Starzyk <[email protected]>
+        Michal Aleksinski <[email protected]>
+        Wojciech Andralojc <[email protected]>
+
+Summary:
+1. Library
+        - Added support for resctrl monitoring via OS interface
+        - Added support for PID group monitoring
+        - Added support for L2 CDP
+        - New API added for adding/removing pids to mon groups
+2. PQoS Utility
+        - Added support for PID group monitoring
+        - Added support for L2 CDP
+        - Print core values in PID monitoring output
+3. rdtset Utility
+        - Added support for L2 CDP
+
 ======================================================================
 Release  v1.2  2017-11-29
 ======================================================================