Update README.md

Author: Oreste Villa

README.md

@@ -44,7 +44,7 @@ used (i.e. nvcc, pgicc, etc).
 ## Requirements
 
 * SM compute capability:              >= 3.5 && SM <= 7.0
-* Host CPU:                           x86\_64, ppc64le
+* Host CPU:                           x86_64, ppc64le
 * OS:                                 Linux
 * GCC version:                        >= 5.3.0
 * CUDA version:                       >= 8.0 && <= 10.1