Migrate from Axios to the built-in Fetch API

[MrRefactoring]

[uncaught]

Just a little caveat with Axios: When you give it a string as data, it will not add the json content type header. At least this was my conclusion when I ran into 400 errors when trying this:

await v3.projectProperties.setProjectProperty({
    projectIdOrKey: jiraProjectId,
    propertyKey: 'my-key',
    propertyValue: 'a-string-value',
  });

I had to wrap my value into an object for Axios to set the correct header.

[MrRefactoring]

Just a little caveat with Axios: When you give it a string as data, it will not add the json content type header. At least this was my conclusion when I ran into 400 errors when trying this:

await v3.projectProperties.setProjectProperty({
projectIdOrKey: jiraProjectId,
propertyKey: 'my-key',
propertyValue: 'a-string-value',
});
I had to wrap my value into an object for Axios to set the correct header.

Oh, sorry for missing that earlier! This does seem like a bug. Would you like to:

1. Create a new issue to report this?
2. Or would you prefer if I open a PR to fix it?