Update README.md

Co-authored-by: Robert Jackson <[email protected]>

README.md

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 ### check
 
 A utility to verify that addons are installed at appropriate versions.  `npm` and `yarn` resolve conflicting transitive dependency requirements by installing multiple versions.  They do not include a mechanism for packages to declare that a dependency must be unique.  This is, however, a practical constraint when building Ember applications (for example, we would not want to build an application that shipped two versions of Ember Data).