release 0.2.0

[koshilife]

• refs need to fix library dependencies because codecov(0.1.17) has been yanked.  #7 fix dependencies.

[codecov-commenter]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           28        28           
=========================================
  Hits            28        28           

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