Add changes in 0.2.0 (#35)

Author: kezhenxu94

CHANGES.md

@@ -2,6 +2,24 @@ Changes by Version
 ==================
 Release Notes.
 
+0.2.0
+------------------
+
+### Features
+
+- Support visualization of heat map
+- Support top N entities, `swctl metrics top 5 --name service_sla`
+- Support thermodynamic metrics, `swctl metrics thermodynamic --name all_heatmap`
+- Support multiple linear metrics, `swctl --display=graph --debug metrics multiple-linear --name all_percentie` 
+- Automatically make use of server timezone API when possible
+
+### Chores
+
+- Generate GraphQL codes dynamically
+- Update merge buttons to only allow squash and commit
+- Add release guide doc
+- Update NOTICE year
+
 0.1.0
 ------------------