Wrong Google Play Services version in step 3 through of Barcode Detection tutorial

[aresilek]

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In step 3 of the Barcode tutorial (https://codelabs.developers.google.com/codelabs/bar-codes/#2) - Configure Build.gradle the version is 7.8.0+ while at a minimum version 8.1 is needed. Using 7.8.0 results in a crash when using the camera.

See StackOverflow question: http://stackoverflow.com/questions/35029175/getting-exception-when-setting-frame-builder-in-eclipse

Also the source code in the sample specifies version 8.1 in the comments: https://github.com/googlesamples/android-vision/blob/master/visionSamples/barcode-reader/app/build.gradle