docs(README): fix text about the tests helper

adopted-ember-addons / ember-cli-flash

Simple, highly configurable flash messages for ember-cli

https://www.npmjs.com/package/ember-cli-flash

MIT License

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Closed MrChocolatine closed 3 years ago

MrChocolatine commented 3 years ago

The previous private method mentioned, _setInitialState, was deleted years ago.