Update README

Added link to puppet-module-testing

Author: vStone

README

@@ -7,3 +7,8 @@ here: https://github.com/vStone/talk-puppet-module-testing-revealjs
 
 If you feel like a basic example test is missing, the solution is a pull
 request away.
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+## Note
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+You can find a more complete example here: https://github.com/vstone/puppet-module-testing