v3.5 Fixed work code parsing error.

Support 6~8 digits work code.

v3.4 Fixed title parsing error

Fixed title parsing error.

v3.3 Development version

New feature:
Support recursive processing.

v3.2

New feature:
Improve the filename replacement method:

1. Replace windows invalid string from halfwidth to fullwidth instead of space.
2. Convert multiple space to one.

v3.1

New feature:
Add new attribute "type" of work.

v3.0 Stable version

New feature:
Support downloading cover image if necessary.

Bug fixed:
Fixed bugs about error handling failure.

v2.1

Bug fixed for missing work_age value.

v2.0

New feature:

1. Support more type of work with prefix "BJ" and "VJ".
2. Support more keyword: "author", "work_age", "release_date"