Do not pass argv twice

Author: inukshuk

lib/cli/cli.js

@@ -32,7 +32,7 @@ exports.main = (argv = process.argv.slice(2)) => {
 
   Error.stackTraceLimit = Infinity; // configurable via --stack-trace-limit?
 
-  yargs(argv)
+  yargs()
     .scriptName('mocha')
     .command(commands.run)
     .command(commands.init)