Merge branch 'hotfix/requests_exception'
Merge branch 'release/0.2'
Merge branch 'release/0.3'
Merge branch 'release/0.4'
Add cache using session to speed up 8comic.
Implement CoimicSiteParser.
Change the code structure.
Merge branch 'feature/fasten_8comic' into develop
Merge branch 'release/0.5'
Fix bug: first and last chapter of 8comic.
Merge branch 'hotfix/8comic_last' into develop