GitLab CI: Use buster instead of stretch.

matemat/primitives/Product.py

@@ -1,6 +1,17 @@
 
+from inspect import stack
+
+
 class Product(object):
 
+    def __init__(self):
+        print(stack())
+        self._product_id: int = 0
+        self._name: str = ''
+        self._price_member: int = 0
+        self._price_non_member: int = 0
+        raise NotImplementedError('This shoudt not be called!')
+
     def __init__(self,
                  product_id: int,
                  name: str,

setup.py

@@ -2,7 +2,7 @@ from setuptools import setup
 
 setup(
     name='matemat',
-    version='2.00',
+    version='2.0',
     packages=['matemat'],
     url='',
     license='',