Use onClick instead of onPress for button sample

[cgrail]

In the readme the sample code for the button doesn't work.

Changed in: #48

[CLAassistant]

All committers have signed the CLA.

[vbersch]

Good find, thank you :)

[codecov-io]

Codecov Report

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The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #192   +/-   ##
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  Coverage          ?   73.69%           
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  Files             ?      150           
  Lines             ?     3493           
  Branches          ?      616           
=========================================
  Hits              ?     2574           
  Misses            ?      706           
  Partials          ?      213

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