Fix code block example in README.md

[luisFilipePT]

Remove misplaced semicolon.

[codecov-io]

Codecov Report

Merging #357 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #357   +/-   ##
=======================================
  Coverage   90.51%   90.51%           
=======================================
  Files           1        1           
  Lines         116      116           
=======================================
  Hits          105      105           
  Misses         11       11

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