Dry Run Mode

[blond]

Need add dryRun option to run fake copy or fake build of tarball.

It may be necessary to check patterns.

const tartifacts = require('tartifacts');

tartifacts({ dest: 'dest', includes: 'lib/**' }, { dryRun: true });

// cp lib/index.js dest/lib/index.js
// cp lib/cli.js dest/lib/cli.js

[blond]

/cc @rndD