Update README.md

Author: atennapel-mx

README.md

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 Please see [Community Commons Function Library](https://docs.mendix.com/appstore/modules/community-commons-function-library) in the Mendix documentation for details.
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+In version 7.2.0 of this module, we introduced a new way of dependency management using a Gradle build file. Unfortunately, this does not mean that obsolete JARs are automatically deleted from your apps' userlib folders when you import this module into your app model.
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+To download the dependencies and copy them to the `userlib` folder of the Community Commons container project, execute `gradle prepareDeps` from the command line. Afterwards, you will be able to export a CommunityCommons.mpk module from the Community Commons main project. Select only the dependencies listed below in the Dependencies section as dependencies in userlib for the exported module.