Improve readme's code example.
Rooby is a new object oriented language written in Go.
## Sample snippet.
-```
+```ruby
class Foo {
def set(x) {
@x = x;
@@ -28,10 +28,10 @@ f2 = Foo.new;
f2.set(21);
b = Bar.new;
b.set(9)
-f2.get() + f1.get() + b.get(); #=> 40
+f2.get + f1.get + b.get; #=> 40
```
-```
+```ruby
class User {
def initialize(name, age) {
@name = name;
