Update README.md to new API

[dreinon]

Closes #139

[codecov]

Codecov Report

Merging #159 (9622ac7) into develop (b9097e6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #159   +/-   ##
========================================
  Coverage    65.41%   65.41%           
========================================
  Files           10       10           
  Lines          292      292           
========================================
  Hits           191      191           
  Misses         101      101           

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