v2.1.3

Fixed bugs as follows:

1. Fixed BOM-caused glossary's first word bug. #67
2. Fixed a bug that prevented cache removal and deletion. #90
3. Fixed a bug that prevented the proper storage of translated ebooks. #106
4. Fixed an asyncio-related bug that was crashing the translation process. #110
5. Removed special characters from translation. #112
6. Fixed the bug where the queue couldn't get the event loop. #115
7. Fixed the bug where settings could not be displayed properly. #116
8. Speed up cache storage on windows.