Refresh the "Testing and Development" section of `README.md`

[mamercad]

SUMMARY

Fixes #268.

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME

• documentation

[codecov[bot]]

Codecov Report

Merging #288 (583db58) into main (67872ed) will decrease coverage by 31.30%. The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #288       +/-   ##
===========================================
- Coverage   62.49%   31.19%   -31.31%     
===========================================
  Files          45       45               
  Lines        3549     3549               
  Branches      720      720               
===========================================
- Hits         2218     1107     -1111     
- Misses       1058     2423     +1365     
+ Partials      273       19      -254     

Flag	Coverage Δ
integration	?
sanity	26.48% <ø> (ø)
units	64.80% <ø> (ø)

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

Impacted Files	Coverage Δ
plugins/modules/digital_ocean_project.py	19.62% <0.00%> (-64.49%)	:arrow_down:
plugins/modules/digital_ocean_droplet.py	10.33% <0.00%> (-58.36%)	:arrow_down:
...lugins/modules/digital_ocean_domain_record_info.py	27.84% <0.00%> (-54.44%)	:arrow_down:
plugins/modules/digital_ocean_database.py	16.21% <0.00%> (-52.03%)	:arrow_down:
plugins/modules/digital_ocean_load_balancer.py	15.43% <0.00%> (-51.68%)	:arrow_down:
plugins/modules/digital_ocean_snapshot.py	24.39% <0.00%> (-51.22%)	:arrow_down:
plugins/modules/digital_ocean_snapshot_info.py	40.00% <0.00%> (-47.50%)	:arrow_down:
plugins/modules/digital_ocean_cdn_endpoints.py	24.69% <0.00%> (-46.92%)	:arrow_down:
plugins/modules/digital_ocean_domain_info.py	41.02% <0.00%> (-46.16%)	:arrow_down:
plugins/modules/digital_ocean_block_storage.py	18.86% <0.00%> (-42.77%)	:arrow_down:
... and 26 more

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[mamercad]

@coreywright What do you think?

[coreywright]

@mamercad :+1: