Easy typos in the readme

[systats]

Hi - thanks for the nice package!

[codecov-io]

Codecov Report

Merging #35 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #35   +/-   ##
====================================
  Coverage      98%   98%           
====================================
  Files           5     5           
  Lines         100   100           
====================================
  Hits           98    98           
  Misses          2     2

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[mfrasco]

Thanks for fixing this! I appreciate it.