Update CHANGELOG, bump version to 0.33

Update CHANGELOG, bump version to 0.32

Update CHANGELOG, bump version to 0.31

Update CHANGELOG, bump version to 0.30

Merge pull request #182 from vasily-v-ryabov/python_39_support

Updates for Python 3.9 support

Merge pull request #175 from vasily-v-ryabov/prepare_0_28

Prepare 0.28

Merge pull request #161 from vasily-v-ryabov/prepare_0_27

Prepare release 0.27

Merge pull request #155 from vasily-v-ryabov/prepare_0_26_clean

Prepare 0.26 release

Merge pull request #138 from vasily-v-ryabov/prepare_0_25

Bump version in __init__.py

python-xlib 0.24