updating singularity def file for v1.0.1

Author: caily

Singularity

@@ -84,7 +84,7 @@ From: ubuntu:18.04
     cd /INSTALLERS
     git clone https://github.com/MASILab/PreQual.git
     cd PreQual
-    git checkout v1.0.0
+    git checkout v1.0.1
     mv src/APPS/* /APPS
     mv src/CODE/* /CODE
     mv src/SUPPLEMENTAL/* /SUPPLEMENTAL