Fix exclusion of examples/ (#467)

Otherwise examples will be installed as a top level module.

Co-authored-by: anilbey <[email protected]>

Author: penguinpee

setup.py

@@ -64,9 +64,8 @@
         'arbor': EXTRA_ARBOR,
         },
     packages=setuptools.find_packages(
-        exclude=(
-            'examples',
-        )),
+        exclude=['examples*'],
+        ),
     author="BlueBrain Project, EPFL",
     author_email="[email protected]",
     description="Bluebrain Python Optimisation Library (bluepyopt)",