Log Message:
p5-Digest-SHA: update to 6.01.

6.01  Mon Dec 25 00:08:08 MST 2017
	- added "--ignore-missing" and "--strict" options to shasum
		-- consistent with GNU coreutils
		-- ref. rt.cpan.org #123897
	- removed PERL_CORE preambles from test scripts
		-- preambles no longer needed for core testing
		-- thanks to Chris Williams for patch
		-- ref. rt.cpan.org #123863

6.00  Fri Dec  8 22:44:44 MST 2017
	- added "tag" option (BSD-style checksums) to shasum
		-- consistent with GNU sha1sum, sha224sum, etc.
		-- thanks to Christopher Tubbs for suggestion
	- modified SHA.pm to use XSLoader
		-- falls back to DynaLoader if necessary
	- decoupled Digest::SHA and Digest::SHA::PurePerl
		-- scripts/tests in each module now fully independent
		-- Digest::SHA::PurePerl to be phased out eventually
			-- past versions will remain available