Sdbuild readme update

[skalade]

Updated sdbuild readme to reflect new API changes in v3.0

[codecov-commenter]

Codecov Report

Merging #1406 (a712e45) into master (93ddd21) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1406   +/-   ##
=======================================
  Coverage   42.85%   42.85%           
=======================================
  Files          30       30           
  Lines        4835     4835           
  Branches      868      868           
=======================================
  Hits         2072     2072           
  Misses       2704     2704           
  Partials       59       59           

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