GHPullRequest isn't reactable

[jmadureira]

Describe the bug
Trying to call Reactable.createAction(...) on a GHPullRequest throws a Not Found error.

To Reproduce
Steps to reproduce the behavior:

1. Create a valid GHPullRequest instance
2. Call the method createAction on that instance

Expected behavior
Not really certain. The URL the the client is trying to access: https://api.github.com/repos/OWNER/REPO/pulls/PR_NUMBER/reactions doesn't really exist so either:

1. The GHPullRequest shouldn't be marked as Reactable or;
2. The GHPullRequest should be calling the https://api.github.com/repos/OWNER/REPO/issues/ISSUE_NUMBER/reactions instead assuming it yields desired result

Desktop (please complete the following information):

• OS: any
• Browser N/A
• Version 1.317 though earlier versions might also be affected

Additional context

[Haarolean]

@jmadureira make sure you have the required permissions, github api also returns 404s in case you don't have the required permissions

[jmadureira]

Hi @Haarolean. I ended up enabling all permissions just in case and still got the same error. The URL the client is trying to access is not listed anywhere in the Github documentation (at least I'm not able to find it).

[gsmet]

You're totally right, there's a bug here. Pull requests should use the issues endpoint to create reactions (as pull requests are indeed issues with additional stuff).

I created #1808 to fix it.