Improve Tooltip example: Add onBlur event

[wasutz]

Currently, we cannot see the Tooltip if the user just clicks the input and did not type anything. I think it can be improved by adding onBlur event.

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[codecov[bot]]

Codecov Report

Merging #196 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #196   +/-   ##
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  Coverage      88%    88%           
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  Files           3      3           
  Lines          25     25           
  Branches       10     10           
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  Hits           22     22           
  Misses          3      3

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