Re-add yargs/yargs#783 workaround for parserConfiguration

Unfortunately yargs configuration in package.json takes precedence over
.parserConfiguration(), so under mocha (which has yargs in its
package.json) the .parserConfiguration() call is ignored.  Re-add the
require.main workaround to prevent this.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

bin/cmd.js

@@ -120,7 +120,10 @@ function modulenameCmd(args, options, callback) {
     return undefined;
   }
 
-  const yargs = new Yargs()
+  // Workaround for https://github.com/yargs/yargs/issues/783
+  // Necessary because mocha package.json overrides .parserConfiguration()
+  require.main = module;
+  const yargs = new Yargs(null, null, require)
     .parserConfiguration({
       'parse-numbers': false,
       'duplicate-arguments-array': false,