fixup! Python: Migrate to use "implicit namespace packages" (PEP 420)

Author: amotl

setup.py

@@ -77,8 +77,9 @@ def read(path):
     extras_require=dict(
         test=[
             'crate[test]>=1.0.0.dev2',
-            'zc.customdoctests<2',
             'cratedb-toolkit[testing]',
+            'sqlalchemy-cratedb',
+            'zc.customdoctests<2',
         ],
         devel=[
             'coverage<8',