fix: conflict with direnv #102
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direnv uses PROMPT_COMMAND variable too, but it uses the approach proposed on this change, so instead of set the value, add the call to the function, and current values are not lost.
In this way silver and direnv can coexist with no interference between them.
see: https://github.com/direnv/direnv/blob/df4c8ec7d45ef7e3290ab1c02ddd1fde1e3bcded/internal/cmd/shell_bash.go#L18