Add FieldRename.pascal

[lynn]

Adds a pascal value to the FieldRename enum, for PascalCase JSON field name encoding.

Resolves #474.

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[lynn]

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[lynn]

I suppose the Travis build fails because json_serializable depends on json_annotation: '>=2.1.0 <2.3.0', which this PR also changes. I don't know how to fix this.

[kevmoo]

I suppose the Travis build fails because json_serializable depends on json_annotation: '>=2.1.0 <2.3.0', which this PR also changes. I don't know how to fix this.

You need to add a dependency override to json_serializable.

See 9fcee71#diff-dd8c9829cd89b90a9d3841afafe125be

[kevmoo]

ABDF – "always be dartfmt"ing 😄

[kevmoo]

@lrhn is input[0] better/worse than input.substring(0, 1)?

[kevmoo]

@natebosch @jakemac53 – thoughts on this?

[kevmoo]

Going to wait on Lasse to comment on the string bits... *From: *Nate Bosch <notifications@github.com> *Date: *Wed, May 8, 2019 at 2:58 PM *To: *dart-lang/json_serializable *Cc: *Kevin Moore, Comment *@natebosch* approved this pull request.

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[kevmoo]

There are some pubspec/changelog tweaks that should be done, but I'll take care of those.

Thanks!