runner.md in jets-4.0.5

- old
+ new

@@ -12,6 +12,29 @@
 ```ruby
 puts "hello world: #{Jets.env}"
 ```
 
     $ jets runner file://script.rb
-    hello world: development
\ No newline at end of file
+    hello world: development
+
+
+Optionally pass in an argument on the command line:
+
+    Usage: jets runner file|Ruby code [args]
+
+The argument will be assigned to the `args` variable.
+
+Example:
+
+    $ jets runner 'puts "hello world with args: #{args}"' 123
+    hello world with args: 123
+
+
+Example with script.rb:
+
+```ruby
+puts "hello world with args: #{args}"
+```
+
+    $ jets runner file://script.rb 123
+    hello world with args: 123
+