Refactor/flutter updates

[JalexChen]

• Builds off #15 since it was a really old PR. Thank you @joshuadeguzman
• Closes #13 Updated examples and adds - checkout step so users who copy it verbatim are not confused
• Closes #14

This will be a patch release

[JalexChen]

@KyleTryon @ryanbourdais

[JalexChen]

These changes shouldn't all be in one PR.

1. That's our recommended approach on the team.
2. You're forcing all users of the current major version to update just to get a bug fix (version param).

normally i would agree with the smaller PRs, but some of these updates were intertwined with the flutter version, dependency updates, and updating flutter would require some changes in the sample app

i would say the first three commits + checkout commit could be a patch version

the command name change and version parameter can be a minor change. in my mind they are technically "breaking" changes but not necessarily in how it works, so what you said regarding the major version makes sense. i'd like to bundle these two together to limit incrementing the version

how does that sound?

@felicianotech

[ryanbourdais]

I see why you wrapped all of this in one PR, but I do agree with Ricardo, this probably should have been 1 for the version changes, 1 for building off of #15 , and another for the breaking change of changing the name of install_android_gradle. Besides that I do agree that even though it is "breaking" it probably can be rolled into a minor version instead of major, and otherwise it all looks good to me. Definitely happy to see the backlog being cleared with this.

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[JalexChen]

@ryanbourdais - the version changes were already included in #15, but i updated them to something more recent since there are almost a year of updates

i've updated the PR to only include those changes and will have separate PRs for the breaking changes

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