Update pubspec.yaml

[Danyson]

update dev dependencies of pubspec.yaml file , the not updated version in master branch will produce infinte loop after using pub get command.

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[Danyson]

@googlebot I signed it!

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CLAs look good, thanks!

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[kwalrath]

Hi, @Danyson. The contents of this repo are generated, and the main source is in https://github.com/dart-lang/site-angulardart/tree/master/examples/ng/doc/toh-6. Could you create a PR there?

(It also looks like we need to update the README for this repo — also auto-generated — to point to the right source repo. That looks like a change for https://github.com/dart-lang/dart-doc-syncer.)

[Danyson]

Hi, @Danyson. The contents of this repo are generated, and the main source is in https://github.com/dart-lang/site-angulardart/tree/master/examples/ng/doc/toh-6. Could you create a PR there?

(It also looks like we need to update the README for this repo — also auto-generated — to point to the right source repo. That looks like a change for https://github.com/dart-lang/dart-doc-syncer.)

Sure,@kwalrath thanks for sharing the proper source repo.