DOC update release history for v0.2.0

Author: ZhiningLiu1998

docs/source/release_history.rst

@@ -1,25 +1,30 @@
 Release History
 ***************
 
-Version 0.1.8 (2023.02)
+Version 0.2.0 (2023.02)
 =========================
 
 Enhancement:
 
-- Add unit test for all ensemble classifiers and samplers.
-- Following sklearn version >1.2, for all ensemble classifiers, 
-
-  - the parameter ``base_estimator`` is renamed to ``estimator``.
-  - the attribute ``base_estimator_`` is renamed to ``estimator_``.
+- Enable CircleCI with CodeCov report.
+- Easier usage:
+  
+  - the package is now imported as ``imbens``
+  - all samplers can be directly accessed in ``imbens.sampler``
 
 Maintenance:
 
+- Complement unit tests (59% -> 96% coverage).
 - Set default ``k_neighbors=1`` for SMOTEBagging to prevent error in few-shot cases.
 - Set default ``cluster_balance_threshold=0.1`` for KmeansSMOTEBoost to prevent error in few-shot cases.
-- Add ``decision_function()`` for supported ensembles.
+- Add ``decision_function()`` for supported ensemble classifiers.
 - The parameter ``base_sampler`` is renamed to ``sampler``.
 - The attribute ``base_sampler_`` is renamed to ``sampler_``.
 - Bump supported Python version to ``3.8, 3.9, 3.10, 3.11``.
+- Following sklearn version >1.2, for all ensemble classifiers, 
+
+  - the parameter ``base_estimator`` is renamed to ``estimator``.
+  - the attribute ``base_estimator_`` is renamed to ``estimator_``.
 
 Bug Fixes: