Bump USER_AGENT version 0.1.20 (dev).

[p0psicles]

• PR is based on the DEVELOP branch
• Don't send big changes all at once. Split up big PRs into multiple smaller PRs that are easier to manage and review
• Read the contribution guide

[codecov-io]

Codecov Report

Merging #3403 into develop will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           develop    #3403   +/-   ##
========================================
  Coverage    33.07%   33.07%           
========================================
  Files          275      275           
  Lines        34582    34582           
========================================
  Hits         11437    11437           
  Misses       23145    23145

Impacted Files	Coverage Δ
medusa/common.py	78.28% <100%> (ø)	⬆️

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