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add null safety guide to readme (#299)
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‎packages/pigeon/README.md‎

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## Null Safety (NNBD)
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In order to generate null-safe code run the command line with the extra argument
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`--dart_null_safety`. For example:
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`flutter pub run pigeon --input ./pigeons/messages.dart --dart_null_safety`.
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## Feedback
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File an issue in [flutter/flutter](https://github.com/flutter/flutter) with the

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