Add line number pattern to --help on CLI

Author: jbpros

lib/cucumber/cli.js

@@ -20,7 +20,7 @@ var Cli = function(argv) {
     },
 
     displayHelp: function displayHelp(callback) {
-      process.stdout.write("Usage: cucumber.js [options] [FILE|DIR]+\n\
+      process.stdout.write("Usage: cucumber.js [options] [[FILE|DIR][:LINE]]+\n\
 \n\
 -r, --require LIBRARY|DIR     Require files before executing the features. If\n\
                               this option is not specified, all *.js and\n\