v1.4.0

This release adds the ‘-b/--basename’ flag.  This flag is very useful
for ensuring that you only alter the basename of the given input paths;
accidentally altering the parent paths is a common mistake.

A quick example:

    $ mkdir -p foo/bar
    $ touch foo/bar/{a,b,c}
    $ ls foo/bar/* | mmv --basename --verbose tr a-z A-Z
    renamed ‘…/foo/bar/a’ -> ‘…/foo/bar/A’
    renamed ‘…/foo/bar/b’ -> ‘…/foo/bar/B’
    renamed ‘…/foo/bar/c’ -> ‘…/foo/bar/C’
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