chore: version bump

Author: mobiusklein

setup.py

@@ -119,7 +119,7 @@ def status_msgs(*msgs):
 def run_setup(include_cext=True):
     setup(
         name='brain-isotopic-distribution',
-        version='1.5.19',
+        version='1.5.20',
         packages=find_packages(where='src'),
         package_dir={"": "src"},
         description="Fast and efficient theoretical isotopic profile generation",