Update README.md

Author: mcustiel

README.md

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 # phiremock-codeception-extension
 Codeception extension and module to make working with [Phiremock](https://github.com/mcustiel/phiremock) even easier. It allows to start a Phiremock server  specifically for the acceptance tests to run or to connect to an already running Phiremock server.
 
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