WIP: having exhaustive feature selector take a custom iterator as input

.github/workflows/python-package-conda.yml

@@ -0,0 +1,38 @@
+name: Python Package using Conda
+
+on: [push]
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 5
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+    - name: Add conda to system path
+      run: |
+        # $CONDA is an environment variable pointing to the root of the miniconda directory
+        echo $CONDA/bin >> $GITHUB_PATH
+    - name: Install dependencies
+      run: |
+        conda env update --file environment.yml --name base
+    - name: Lint with flake8
+      run: |
+        conda install flake8
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Test with pytest
+      run: |
+        conda install numpy scipy scikit-learn pandas tensorflow joblib pytest
+        conda install imageio scikit-image
+        conda install -c conda-forge dlib
+        pip install markdown
+        pip install -e  .
+        pytest -sv

README.md

@@ -143,6 +143,4 @@ according to the terms and conditions of the Creative Commons Attribution 4.0 In
 
 ## Contact
 
-I received a lot of feedback and questions about mlxtend recently, and I thought that it would be worthwhile to set up a public communication channel. Before you write an email with a question about mlxtend, please consider posting it here since it can also be useful to others! Please join the [Google Groups Mailing List](https://groups.google.com/forum/#!forum/mlxtend)!
-
-If Google Groups is not for you, please feel free to write me an [email](mailto:mail@sebastianraschka.com) or consider filing an issue on [GitHub's issue tracker](https://github.com/rasbt/mlxtend/issues) for new feature requests or bug reports. In addition, I setup a [Gitter channel](https://gitter.im/rasbt/mlxtend?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) for live discussions.
+The best way to ask questions is via the [GitHub Discussions channel](https://github.com/rasbt/mlxtend/discussions). In case you encounter usage bugs, please don't hesitate to use the [GitHub's issue tracker](https://github.com/rasbt/mlxtend/issues) directly. 

docs/sources/CHANGELOG.md

@@ -7,11 +7,41 @@ The CHANGELOG for the current development version is available at
 
 ---
 
-### Version 0.18.1 (TBD)
+### Version 0.20.0 (TBD)
 
 ##### Downloads
 
-- -
+- [Source code (zip)](https://github.com/rasbt/mlxtend/archive/v0.20.0.zip)
+
+- [Source code (tar.gz)](https://github.com/rasbt/mlxtend/archive/v0.20.0.tar.gz)
+
+
+
+##### New Features
+
+- 
+
+##### Changes
+
+- Due to compatibility issues with newer package versions, certain functions from six.py have been removed so that mlxtend may not work anymore with Python 2.7.
+- As an internal change to speed up unit testing, unit testing is now faciliated by GitHub workflows, and Travis CI and Appveyor hooks have been removed.
+##### Bug Fixes
+
+- Fix unreadable labels in `heatmap` for certain colormaps. ([#852](https://github.com/rasbt/mlxtend/pull/852))
+
+
+
+
+
+### Version 0.19.0 (09/02/2021)
+
+##### Downloads
+
+- [Source code (zip)](https://github.com/rasbt/mlxtend/archive/v0.19.0.zip)
+
+- [Source code (tar.gz)](https://github.com/rasbt/mlxtend/archive/v0.19.0.tar.gz)
+
+
 
 ##### New Features
 
@@ -27,11 +57,14 @@ The CHANGELOG for the current development version is available at
 - Removes deprecated `res` argument from `plot_decision_regions`. ([#803](https://github.com/rasbt/mlxtend/pull/803))
 - Adds a `title_fontsize` parameter to `plot_learning_curves` for controlling the title font size; also the plot style is now the matplotlib default. ([#818](https://github.com/rasbt/mlxtend/pull/818))
 - Internal change using `'c': 'none'` instead of `'c': ''` in `mlxtend.plotting.plot_decision_regions`'s scatterplot highlights to stay compatible with Matplotlib 3.4 and newer. ([#822](https://github.com/rasbt/mlxtend/pull/822))
-- Adds a `fontcolor_threshold` parameter to the `mlxtend.plotting.plot_confusion_matrix` function as an additional option for determining the font color cut-off manually. ([#825](https://github.com/rasbt/mlxtend/pull/825))
+- Adds a `fontcolor_threshold` parameter to the `mlxtend.plotting.plot_confusion_matrix` function as an additional option for determining the font color cut-off manually. ([#827](https://github.com/rasbt/mlxtend/pull/827))
+- The `frequent_patterns.association_rules` now raises a `ValueError` if an empty frequent itemset DataFrame is passed. ([#843](https://github.com/rasbt/mlxtend/pull/843))
+- The .632 and .632+ bootstrap method implemented in the `mlxtend.evaluate.bootstrap_point632_score` function now use the whole training set for the resubstitution weighting term instead of the internal training set that is a new bootstrap sample in each round. ([#844](https://github.com/rasbt/mlxtend/pull/844))
 
 ##### Bug Fixes
 
-- - 
+- Fixes a typo in the SequentialFeatureSelector documentation ([#835](https://github.com/rasbt/mlxtend/issues/835) via [João Pedro Zanlorensi Cardoso](https://github.com/joaozanlorensi))
+
 
 ### Version 0.18.0 (11/25/2020)