Remove 'round-places' argument from 'OasisMarketMakerKeeper'

[adamjsawicki]

Fixes #2.

[codecov-io]

Codecov Report

Merging #133 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
+ Coverage    17.8%   17.81%   +<.01%     
==========================================
  Files          41       41              
  Lines        4257     4256       -1     
==========================================
  Hits          758      758              
+ Misses       3499     3498       -1

Impacted Files	Coverage Δ
market_maker_keeper/oasis_market_maker_keeper.py	29.32% <ø> (+0.21%)	⬆️

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[adamjsawicki]

@reverendus can this merge?

[ghost]

@swixx I think all these projects have new maintainers already.