Major rewrite of `fastqe` as version 0.2.1 in July 2020:
- refactor code to support new options
- add long read support with --long
- add --noemoji for block-based output on systems that don't support emoji
- add --custom for user-defined mapping to emoji
- add --output to redirect to file instead of stdout
- add gzip support
- add redirect from stdin support
- fix bug of dropping position if some sequences are only 0 quality