removed postgres, but not postgresql, support

Author: dmalan

setup.py

@@ -16,5 +16,5 @@
     package_dir={"": "src"},
     packages=["cs50"],
     url="https://github.com/cs50/python-cs50",
-    version="7.1.0"
+    version="8.0.0"
 )

tests/sql.py

@@ -169,10 +169,6 @@ def setUp(self):
     def test_cte(self):
         self.assertEqual(self.db.execute("WITH foo AS ( SELECT 1 AS bar ) SELECT bar FROM foo"), [{"bar": 1}])
 
-    def test_postgres_scheme(self):
-        db = SQL("postgres://postgres:[email protected]/test")
-        db.execute("SELECT 1")
-
 
 class SQLiteTests(SQLTests):