Programmatically generate SVG (vector) images, animations, and interactive Jupyter widgets

Add Jupyter lab warning to widget examples

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README.md
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![Example output image](https://raw.githubusercontent.com/cduck/drawSvg/master/examples/example5.gif)
### Animation with Python
```python
import drawSvg as draw
···
```
![Example output image](https://raw.githubusercontent.com/cduck/drawSvg/master/examples/example7.gif)
···
![Example output image](https://raw.githubusercontent.com/cduck/drawSvg/master/examples/example5.gif)
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Note: If the above example does not work in Jupyter Lab, try `Help > Launch Classic Notebook`.
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### Animation with Python
```python
import drawSvg as draw
···
```
![Example output image](https://raw.githubusercontent.com/cduck/drawSvg/master/examples/example7.gif)
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Note: If the above example does not work in Jupyter Lab, try `Help > Launch Classic Notebook`.