Update README.md

Author: stefanherdy

README.md

@@ -13,11 +13,11 @@ Some utils to preprocess images for semantic image segmentation and to download
 
 Installation
 
-'''shell
+```shell
 
 $ git clone https://github.com/stefanherdy/deep-learning-semantic-segmentation-data-preprocessing-utils.git
 $ cd your-repository
-'''
+```
 # Usage
 
 The files in this repository can be used as standalone files. You can use single files of the repository according to your requirements or just test the files on the provided sample image.