fix formatting

Author: akohlmey

README.md

@@ -32,6 +32,8 @@ The programme specifically addresses the needs of scientists using, writing, or
 ## Materials used during the School
 
 #### Day 1
+
 **Introduction to High-Performance Computing** [[Slides]](day1/hpc-intro.pdf)
+
 **Foundation of Modern Computer Architecture** [[Slides]](day1/Foundation-of-Modern-Computer-Architecture.pdf) [[Hands on]](https://github.com/silviostanzani/ICTP-HPC/tree/master/Foundation-of-Modern-Computer-Architecture)