Update README.md

Author: sichkar-valentyn

README.md

@@ -19,7 +19,7 @@ Image processing. Getting data from images in form of matrix with numbers, slici
 Codes (it'll send you to appropriate file):
 * [Opening_png_jpg](https://github.com/sichkar-valentyn/Image_processing_in_Python/tree/master/Codes/Opening_png_jpg.py)
 * [Converting_RGB_to_GreyScale](https://github.com/sichkar-valentyn/Image_processing_in_Python/tree/master/Codes/Converting_RGB_to_GreyScale.py)
-* [Symple_Filtering](https://github.com/sichkar-valentyn/Image_processing_in_Python/tree/master/Codes/Symple_Filtering.py)
+* [Simple_Filtering](https://github.com/sichkar-valentyn/Image_processing_in_Python/tree/master/Codes/Simple_Filtering.py)
 
 <br/>
 Experimental results (figures and tables on this page):