[Bug][Jupyter Widget] Is there a way to use kepler in colab?

**Describe the bug**
I'd like to be able to use kepler in the context of google colab notebooks. It appears to be not currently possible. Following the steps in the user guide doesn't generate a map, instead only showing a link to the user guide.

**To Reproduce**
Steps to reproduce the behavior:
Open a new google colab notebook, try to make a map, such as with the code

```python
from keplergl import KeplerGl
map_1 = KeplerGl()
map_1
```
Which should yield a map, but instead gives:

```sh
User Guide: https://github.com/keplergl/kepler.gl/blob/master/docs/keplergl-jupyter/user-guide.md
```

**Environment (please complete the following information):**
- Python version: python3
- google colab
- keplergl Widget version 0.1.2