Update change log with version 1.1.

CHANGELOG.md

@@ -3,9 +3,22 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
 ## [Unreleased]
+
+## [1.1] - 2020-10-27
 ### Added
+- Hoeffding Tree
+- Exponential Reservoir Sampling
+- Mondrian Forest
+- Naïve Bayes
+- Multilayer perceptron
+
+### Changed
+- Reservoir Sampling is split in two classes
+- Functions to add elements in Reservoir Sampling now return the index where the element is added.
+
+### Fixed
+- Reservoir Sampling statistical bugs
 
 ## [1.0] - 2019-06-20
 ### Added
@@ -15,3 +28,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Lightweight Temporal Compression (LTC)
 - Bloom Filter
 - Cuckoo Filter
+