Add code to display inside Google Colab

[korakot]

Description

This fixes issue #102 to display plot in Colab correctly.

How Has This Been Tested?

I test this will a minimal example plot(df) where df is sns.load_dataset('titanic')

In colab you need to install dataprep first with !pip install -U tornado dataprep then restart the runtime.

Snapshots:

Include snapshots for easier review.

Checklist:

• My code follows the style guidelines of this project
• I have already squashed the commits and make the commit message conform to the project standard.
• I have already marked the commit with "BREAKING CHANGE" or "Fixes #" if needed.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[dovahcrow]

@korakot Thanks for your PR! May I ask if it is safe to load bokeh scripts multiple times in parallel?

It seems to me load_notebook(hide_banner=True) will add script tags to the cell output to load the bokeh library. If I have multiple cells output the plots, when reopening the Colab notebook, multiple bokeh scripts will be loaded simultaneously.

[korakot]

For Colab, each cell is an IFrame. So, each need to load bokeh separately. That's why it needs to be called here in Report._repr_html_(). Yes, it should be safe.

[dovahcrow]

Great! Thanks for your contribution!

[codecov]

Codecov Report

Merging #220 into develop will decrease coverage by 0.04%.
The diff coverage is 57.14%.

@@             Coverage Diff             @@
##           develop     #220      +/-   ##
===========================================
- Coverage    75.58%   75.53%   -0.05%     
===========================================
  Files           28       28              
  Lines         2822     2829       +7     
===========================================
+ Hits          2133     2137       +4     
- Misses         689      692       +3     

Impacted Files	Coverage Δ
dataprep/eda/report.py	87.50% <57.14%> (-8.50%)	⬇️

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