Updates the screenshot of the readme

README.md

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 This package adds syntax highlighting and optional linting for the MiniZinc modeling language (.mzn and .dzn files). The package is based on the [similar package for Sublime](https://github.com/astenmark/sublime-mzn).
 
-![A small preview](https://raw.githubusercontent.com/jjdekker/language-mzn/master/screen.png)
+![A small preview](https://raw.githubusercontent.com/jjdekker/language-mzn/master/sample.png)
 
 ## About MiniZinc
 

sample.mzn

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+% Model of the queens problem
+include "globals.mzn";
+
+% parameters
+int: n=;
+
+
+
+% variables
+array[1..n] of var 1..n: R;
+
+% constraints
+constraint all_different(R);
+constraint all_different([R[i] + i | i in 1..n]);
+constraint all_different([R[i] + i | i in 1..n]);
+
+% objective
+solve satisfy;
+
+% output
+output [show(R)];