github_events: Incoherent values for `issue_labels` and `issue_state`

[canasdiaz]

While studying the Angular community I've found an error in the GitHub index with events (name github_events).

In this PR have a look at the following events:

• kara approves the changes
• AndreKushnir replace a label 5 minutes later. Label added: action:merge. Label removed: action:review
• Jessica Janiuk closes the PR 8 minutes later

In the image below you can see the index I got using the latest version of GrimoireLab. The action:merge label is set before the LabeledEvent. The issue_state field is set to closed before the PR gets closed.