Flutter example cleaning#92

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rxlabz wants to merge 3 commits intomainfrom

fix/flutter_example

Commits on Oct 5, 2020

remove Development team ID (Flutter will try to assign the user's default)
rxlabz
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Commits on Oct 6, 2020

- add a link to the flutter issue related to NullThrownException and AssertionError when a debugger is attached
rxlabz
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update dependencies
rxlabz
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