feat(issue): Disable merge button if not possible #425
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Fixes #128.
The main idea is to leverage the field
mergeable
provided by the pull request API. Besides, I refactor a little about the logic of fetching a issue. That's because I want to only fetch pull request if the issue is a pull request. At last, I find out some basic fields are still needed by using the issue API, so I give up the API replacement but keep the refactor.