Summary
-------
Change the message digest algorithm from MD5 to SHA-256

Problem
-------

javap includes an MD5 checksum in its verbose output. This should be updated to use a more modern algorithm.

Solution
--------

Change the algorithm to use SHA-256.

Specification
-------------

The man page is updated to refer to SHA-256.


    @@ -84,7 +84,7 @@
     :   Prints internal type signatures.
 
     `-sysinfo`
    -:   Shows system information (path, size, date, MD5 hash) of the class being
    +:   Shows system information (path, size, date, SHA-256 hash) of the class being processed.
 
     `-constants`