update readme with case study data links

README.md

@@ -234,7 +234,7 @@ tar -xvf Tabula_Muris.tar.gz
 mv mnt/mcfiles/Datasets/Tabula_Muris data
 rm -r mnt
 ```
-#### Case study dataset
+##### Case study dataset
 
 The dataset we used in the case study is from (O’Koren et al), you can download 
 all the relevant files via [this link](https://www.svi.edu.au/MIG_2019_scRNAseq-workshop/case_study_data.tar.gz)