add CHANGES

Author: thierrymoudiki

CHANGES.md

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+# version 2.3.0 (2024-08-27)
+
+- add nonparametric confidence intervals for average effects
+
+# version 2.2.2 (2024-08-18)
+
+- Include Random Vector Functional Link Networks
+- Add online learning 
+- Read: https://thierrymoudiki.github.io/blog/2024/08/19/r/python/code-conformal-adaptive-RVFL