update

• fix: cannot save paper when it's title contains illegal character

update

• use paper's tile as file name instead of the internal name
• fix crashing problem when searching fail
• other minor update

update

• now can identify and rename PDF document automatically
• fix a bug about multi-thread downloading
• now support more search options (range, filter, order)
• adjust some text output
• other minor update

• emergency fix a bug when writing data to disk
• sorry for my lazy to test :(

update

• a simple update system
• support progress bar when downloading a document
• more user friendly console UI

update

• fix a issue about file name generation in *unix system
• remove some useless output
• build and compress automatically (like a toy)