feat: Use shorthand flags for BusyBox sort compatibility #12
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The GNU `sort` program [explicitly supports](https://www.gnu.org/software/coreutils/manual/html_node/sort-invocation.html) both the extended `--numeric-sort` and `--reverse` flags, and the shorthand `-n` and `-r` flags. However, BusyBox `sort` only supports shorthand `-n` and `-r` flags. This changes should allow for compatibility with both sort programs so that `prsync` runs on distributions with BusyBox such as Alpine Linux.
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The GNU
sortprogram explicitly supports both the long--numeric-sortand--reverseflags, and the shorthand-nand-rflags. However, BusyBoxsortonly supports shorthand-nand-rflags. This changes should allow for compatibility with both sort programs so thatprsyncruns on distributions with BusyBox such as Alpine Linux.