Update setup.py

Author: hippke

setup.py

@@ -6,7 +6,7 @@
     long_description = f.read()
 
 setup(name='transitleastsquares',
-      version='1.0.19',
+      version='1.0.20',
       description='An optimized transit-fitting algorithm to search for periodic transits of small planets',
       long_description=long_description,
       long_description_content_type='text/markdown',