[BUG] Notebooks do not work on Google Colab

[chicolucio]

Describe the bug
Python version of Google Colab is too old (3.7) and the package requires >=3.8

To Reproduce
Steps to reproduce the behavior:

1. open notebooks with Colab link
2. uncomment the lines at the first as request
3. Does not work (should add src before ph_diagrams)
4. Try install the package with pip install pH-diagrams
5. Does not work

Expected behavior
Just works...

Screenshots
NA

Specification

• pH-diagrams: 0.3.2
• Python version: 3.7
• platform: Google Colab

Additional context

And that is how Google deals with it: googlecolab/colabtools#2165 I'm considering drop Colab links...

All notebooks work in a local environment with Python >= 3.8.

Deepnote can be an alternative. But it has issues with ipywidgets:

• https://community.deepnote.com/c/ask-anything/ipywidgets
• https://community.deepnote.com/c/ask-anything/when-will-ipywidgets-support-be-added

[chicolucio]

Colab links removed in v.0.3.3. I will leave this issue open for a while, thinking about an alternative.