make doctest more lenientfor sqlalchemy 1.4

src/zope/sqlalchemy/README.rst

@@ -188,7 +188,7 @@ to the DB.
     >>> conn = session.connection()
     >>> users = Base.metadata.tables['test_users']
     >>> conn.execute(users.update(users.c.name=='bob'), name='ben')
-    <sqlalchemy.engine...ResultProxy object at ...>
+    <sqlalchemy.engine... object at ...>
     >>> from zope.sqlalchemy import mark_changed
     >>> mark_changed(session)
     >>> transaction.commit()
@@ -206,7 +206,7 @@ session in the 'changed' state initially.
     >>> session = Session()
     >>> conn = session.connection()
     >>> conn.execute(users.update(users.c.name=='ben'), name='bob')
-    <sqlalchemy.engine...ResultProxy object at ...>
+    <sqlalchemy.engine... object at ...>
     >>> transaction.commit()
     >>> session = Session()
     >>> str(session.query(User).all()[0].name)

tox.ini

@@ -6,6 +6,7 @@ envlist =
     lint
     py{27,35,36}-sqlalchemy{09,10}
     py{27,35,36,37,38,39}-sqlalchemy{11,12,13}
+    py{37,38,39}-sqlalchemy{14}
     coverage
 
 [testenv]