Update README.md

gbrits · Aug 9, 2018 · ba9b977 · ba9b977
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 This demo application is aim to describe how to use `@ionic-native/google-maps` with Ionic v4.
 
 [sample.apk](./sample.apk)
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+## Before use this demo...
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+Please replace `(API key)` in  `config.xml` and `package.json` files with your API keys.