message: Fix html report path
diff: # HTML Report
  Criterion.rs can generate an HTML report displaying the results of the benchmark under
  -`target/criterion/report/index.html`. By default, the plots are generated using
  +`target/criterion/reports/index.html`. By default, the plots are generated using
  [gnuplot](http://www.gnuplot.info/) if it is available, or the
  [plotters](https://github.com/38/plotters) crate if it is not. The example below was generated
  using the gnuplot backend, but the charts generated by plotters are similar.
  