Trailing space on closing Github code blocks fails to

[jasononeil]

```haxe
var x = 12;
trace('The sum of $x and 3 is ${x + 3}'); // The sum of 12 and 3 is 15

String interpolation is ....

This example was from the Haxe manual.  

I'm happy to take a look at this at some point not this week if you remind me :)

[jasononeil]

Please note - the trailing space on line 4 of the example. Works fine if we remove the space.