Release prep v0.21.1

[vringar]

As the current release has some errors that I didn't detect during the release process, they are now being fixed in v0.21.1

[codecov-commenter]

Codecov Report

Base: 52.53% // Head: 49.07% // Decreases project coverage by -3.46% ⚠️

Coverage data is based on head (5ad7bbf) compared to base (caf7bc5).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1010      +/-   ##
==========================================
- Coverage   52.53%   49.07%   -3.47%     
==========================================
  Files          33       33              
  Lines        3390     3391       +1     
==========================================
- Hits         1781     1664     -117     
- Misses       1609     1727     +118     

Impacted Files	Coverage Δ
openwpm/deploy_browsers/selenium_firefox.py	28.33% <0.00%> (-0.49%)	⬇️
openwpm/command_sequence.py	55.38% <0.00%> (-38.47%)	⬇️
openwpm/errors.py	71.42% <0.00%> (-28.58%)	⬇️
openwpm/commands/profile_commands.py	52.83% <0.00%> (-28.31%)	⬇️
openwpm/utilities/db_utils.py	73.33% <0.00%> (-23.34%)	⬇️
openwpm/config.py	84.92% <0.00%> (-11.12%)	⬇️
openwpm/browser_manager.py	68.59% <0.00%> (-6.29%)	⬇️
openwpm/utilities/platform_utils.py	70.96% <0.00%> (-5.38%)	⬇️
openwpm/commands/browser_commands.py	25.00% <0.00%> (-4.30%)	⬇️
openwpm/task_manager.py	76.44% <0.00%> (-3.12%)	⬇️
... and 1 more

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