Add an option screwdrivercd_version to add links to the git source in the project links.

[dwighthubbard]

Add an option for the version updater to add/update a source repository project link that links back to the github hash of the source used to build the package.

Expected Behavior

If the flag is true in the configuration, the generated package will have a project link that points back to the github url of the git hash with the source used to generate the package.

Current Behavior

There is no source project_link

[patrasap0908]

@dwighthubbard, the expected result is for the utility to add a link to the commit's SHA hash that caused the package to get built to metadata section in setup.cfg, correct?

[patrasap0908]

@dwighthubbard, the expected result is for the utility to add a link to the commit's SHA hash that caused the package to get built to metadata section in setup.cfg, correct?

Ignore this comment, take a look at #107 whenever you get a chance.