docs: update changelog

Author: Ahmad Nurjalal

CHANGELOG.md

@@ -1,3 +1,56 @@
+<a name="v0.3.0"></a>
+## [v0.3.0] - 2022-02-03
+
+### Breaking change
+- **core:** rename TokenRepositoryImpl to DefaultTokenRepository
+- **core:** rename ConfigRepositoryImpl to DefaultConfigRepository
+
+### Chore
+- fix broken gradle files
+- publish to nexus on release stage
+- add missing timestamp check
+- add test stage
+- **api:** regenerate services
+- **samples:** regenerate cli
+- **spec:** update spec files
+- **spec:** add timestamp and lobby wsm spec
+
+### Ci
+- build samples
+- **coverity:** initial commit
+
+### Docs
+- **samples:** fix readme cli
+
+### Feat
+- websocket core class
+- add junit
+- **api:** add websocket message models
+- **api:** add function to get collection format and array query string
+- **core:** add helper functions for websocket implementation
+- **core:** add logic to handle array within query string
+- **sample:** add java sdk cli
+- **samples:** update dependency
+- **samples:** java-sdk-poc - get dependency from nexus
+- **samples:** java sdk websocket poc
+
+### Fix
+- **core:** websocket singleton object
+- **api:** delete unnecessary variable
+- upload file handling
+- **core:** set encoding to utf8 instead of system default
+- **core:** thread safe singleton declaration
+- **core:** handle tsv, ssv, pipes collection format
+- **okhttpclient:** use shared okhttpclient and don't swallow jsonprocessingexception
+- **operation:** revise create url a little bit
+- **operation:** make convertInputStreamToString protected
+- **samples:** change websocket class implementation
+- **wrappers:** close httpresponse payload stream after parsing
+
+### Test
+- add test for all collection format type
+- add test for query string params
+
 <a name="v0.2.0"></a>
 ## [v0.2.0] - 2022-01-19
 
@@ -26,4 +79,5 @@
   - platform
       - add, update endpoints
 
+[v0.3.0]: https://github.com/AccelByte/accelbyte-java-sdk/compare/v0.2.0...v0.3.0
 [v0.2.0]: https://github.com/AccelByte/accelbyte-java-sdk/compare/v0.1.0...v0.2.0