Fix for passing in filenames that contain commas #50
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The versions of clap supported by oxipng seems to default to allowing commas to be used as delimiters for passing a series of values in a single physical command line argument, when parsing for a parameter that accepts multiple values. This prevents oxipng from accepting filenames containing commas (it splits them into segments separated by commas and treats each one as a separate path to a file to process, none of which tend to exist). Fixed this by disabling the comma delimiter behavior for the 'files' argument.