Add unicorn_py3 folder to setup.py (#1942)

* Add unicorn_py3 folder to setup.py

* Run sample in CI

* Fix pip install & py2 breakage

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Co-authored-by: mio <mio@lazym.io>

bindings/python/setup.py

@@ -232,7 +232,7 @@ Further information is available at http://www.unicorn-engine.org
 
 setup(
     provides=['unicorn'],
-    packages=['unicorn'],
+    packages=setuptools.find_packages(include=["unicorn", "unicorn.*"]),
     name='unicorn',
     version=VERSION,
     author='Nguyen Anh Quynh',