historically this is kind of a mess, some places set the prefixed ext
(e.g. `.exe`) others don't (e.g. `msi`)
this standardize it to have the preceding `.`
also makes `ByExt` works with or without it so it doesn't break anyone's
config.
Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>
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