Update README.md

Author: taigw

crf_max_flow_matlab/README.md

@@ -3,7 +3,7 @@ This package is a Matlab wrap of maxflow algorithm written in cpp.
 
 To build, run the `make.m` file. 
 
-See `test1.m` and 'test2.m' for examples of using this package. 
+See `test1.m` and `test2.m` for examples of using this package. 
 
 ![crf_2d_matlab](../data/crf_2d_matlab.png)