fix: remove duplicate entry for Burst SMS

[ksmarty]

Description:

Removed a duplicate entry for Burst SMS from the readme

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

[caronc]

Thank you and good catch, I'm not sure how that happened! 👀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.35%. Comparing base (09cd2b6) to head (c0fd60d).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1204   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files         147      147           
  Lines       20326    20326           
  Branches     3979     3979           
=======================================
  Hits        20195    20195           
  Misses        121      121           
  Partials       10       10           

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