Use sed to automatically update api version

[thornbill]

This should probably be handled via a custom template for the openapi generator eventually...

[nielsvanvelzen]

Guess you'll need to write your own generator

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.79%. Comparing base (cdb00ea) to head (71b15c9).
⚠️ Report is 1404 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #231   +/-   ##
=======================================
  Coverage   99.79%   99.79%           
=======================================
  Files          78       78           
  Lines         495      495           
  Branches       52       52           
=======================================
  Hits          494      494           
  Misses          1        1           

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