update with current devs

name of pdf starts now with feature_importance, there is now also another separated vars plot for single input feature importance

.gitlab/issue_templates/release.md

@@ -14,6 +14,7 @@ vX.Y.Z
 * [ ] Adjust `changelog.md` (see template for changelog)
 * [ ] Update version number in `mlair/__ init__.py`
 * [ ] Create new dist file: `python3 setup.py sdist bdist_wheel`
+* [ ] Add new dist file `mlair-X.Y.Z-py3-none-any.whl` to git
 * [ ] Update file link `distribution file (current version)` in `README.md`
 * [ ] Update file link in `docs/_source/installation.rst`
 * [ ] Commit + push