docs: update code example

[mt9eet]

I found that errors are thrown if we render the component without the generateConfig and locale props, so I added them to the example code to make it clearer.

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[codecov[bot]]

Codecov Report

Merging #240 (e5a6145) into master (8bc4cce) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #240   +/-   ##
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  Coverage   99.52%   99.52%           
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  Files          45       45           
  Lines        2113     2113           
  Branches      622      622           
=======================================
  Hits         2103     2103           
  Misses          8        8           
  Partials        2        2           

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