Support create-pr option

Do you want to request a feature or report a bug? Feature

What is the current behavior? Right now, to send a PR with new types, I need to manually create a PR, which involves forking the repository, create a branch, make the changes, commit, push, and send the PR.

If the current behavior is a bug, please provide the steps to reproduce.

Following an approach similar to patch-package --create-issue flag, we could have a create--pr flag that will automatically create a PR with the type definitions that the user created or modified locally.

What is the expected behavior?

$ flow-typed create-pr <package>@<version>
Please insert a valid GitHub access token with repo:write permissions:
*************
A new Pull Request with your contribution has been created and it's available at https://github.com/flow-typed/flow-typed/pulls/xxxx

If this is a feature request, what is motivation or use case for changing the behavior? The current approach can limit the amount of contributions to this project.

Local Environment Information If this issue is specific to the CLI, provide the results of running npx envinfo from the command line in a GitHub gist.

[FezVrasta]

@Brianzchen I didn’t have time to test it yet, I’m sorry.

[FezVrasta]

One can add them to the same local directory and the script would match them (prepend test_ to the file name)?