feat: visualization initial import
Update README.md
Merge tag '0.4' into develop

Version 0.4
Merge branch 'develop' into feature/visualization
feat: IPython Notebook SVG display
Merge branch 'feature/visualization' into develop
fix: download_as_utf8 converts HTML characters
fix: display actual timestamps instead of '.'
doc: CHANGELOG
Merge branch 'release/0.4.1'