Make commit type detection algorithm more reliable

[le-git-imate]

Description of issue or feature request
Looking into the URL, le-git-imate can detect the commit type since the URL corresponding to each commit has a unique pattern. More details is described here. However, the upload operation on GitLab is an exception as the URL does not have a specific pattern. We should make sure that the current approach to detect upload operation on GitHub is fully reliable.
This issue may be resolved along with #8.

Current behavior

• The current approach to detect upload operation on GitHub is not fully reliable.

Expected behavior

• Make sure that le-git-imate detects commit types correctly (in particular the upload operation on GitLab).
• Add unit tests.