Update README.md

[zhemingfan]

Wheel needs to be upgraded for numpy to successfully install.

[codecov[bot]]

Codecov Report

Merging #316 (9f288e6) into master (479fdeb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #316   +/-   ##
=======================================
  Coverage   86.44%   86.44%           
=======================================
  Files          54       54           
  Lines        9281     9281           
  Branches     2397     2397           
=======================================
  Hits         8023     8023           
  Misses        778      778           
  Partials      480      480           

Flag	Coverage Δ
unittests	86.44% <ø> (ø)

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[creisle]

can you set this to merge this into dev instead and we'll include it in the next release

[zhemingfan]

Changed.