Updates for latest package dependencies

[jdebacker]

This PR updates the CCC code base to work with the latest versions of package dependencies. Pandas and Bokeh were the main reasons for test failures.

Also adding code formatting with Black.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fb9c9c2) 100.00% compared to head (aa1d941) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #380   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines         1112      1109    -3     
=========================================
- Hits          1112      1109    -3     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
ccc/__init__.py	100.00% <100.00%> (ø)
ccc/calcfunctions.py	100.00% <100.00%> (ø)
ccc/calculator.py	100.00% <ø> (ø)
ccc/constants.py	100.00% <100.00%> (ø)
ccc/data.py	100.00% <100.00%> (ø)
ccc/get_taxcalc_rates.py	100.00% <100.00%> (ø)
ccc/parameters.py	100.00% <100.00%> (ø)
ccc/paramfunctions.py	100.00% <100.00%> (ø)
ccc/styles.py	100.00% <100.00%> (ø)
ccc/utils.py	100.00% <100.00%> (ø)