update changelog for 0.3.0 release (#17)

Author: rohanshah18

CHANGELOG.md

@@ -2,10 +2,10 @@
 
 [comment]: <> (When bumping [pc:VERSION_LATEST_RELEASE] create a new entry below)
 
-### v0.2.4
-- Added support for index operations
-  - Ability to create index
-  - Ability to delete index
+### v0.3.0
+- Added ability for index operations to
+  - create index using required and optional fields
+  - delete index
 
 ### v0.2.3
 - Update to use latest protos