Force users to manually enable MD5

[mborland]

Close: #57

[cppalliance-bot]

An automated preview of the documentation is available at https://60.crypt.prtest2.cppalliance.org/libs/crypt/doc/html/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://60.crypt.prtest2.cppalliance.org/libs/crypt/doc/html/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://60.crypt.prtest2.cppalliance.org/libs/crypt/doc/html/index.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5ca3fb8) to head (fb11a7d).
Report is 16 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop       #60   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           40        40           
  Lines         2113      2124   +11     
  Branches       253       255    +2     
=========================================
+ Hits          2113      2124   +11     

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[cppalliance-bot]

An automated preview of the documentation is available at https://60.crypt.prtest2.cppalliance.org/libs/crypt/doc/html/index.html