public Single<Issue> refreshIssue(Repository repository, int issueNumber) {
        return service.getIssue(repository.owner().login(), repository.name(), issueNumber)
                .map(response -> addIssueOrThrow(repository, response, R.string.error_issue_load));
    }
Refresh issue.

@param repository The issues repository
@param issueNumber The issue number
@return A {@link Single} representing the  issues
app/src/main/java/com/github/pockethub/android/core/issue/IssueStore.java