[GH-112] Fix minor errors in readme.

[jealous]

As title.

[codecov-commenter]

Codecov Report

Merging #113 (524606a) into master (201aa0d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #113   +/-   ##
=======================================
  Coverage   98.53%   98.53%           
=======================================
  Files           1        1           
  Lines         681      681           
=======================================
  Hits          671      671           
  Misses         10       10           

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