Incompatible with Python 3.10

[mcepl]

Python 3.10 finally really eliminated all those classes in collections package which were long time ago moved to collections.abc. So, from collections import Iterable truly ceased to work.

This patch:

---
 pytest_verbose_parametrize.py |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/pytest_verbose_parametrize.py
+++ b/pytest_verbose_parametrize.py
@@ -1,4 +1,7 @@
-from collections import Iterable
+try:
+    from collections.abc import Iterable
+except (ImportError, ModuleNotFoundError):
+    from collections import Iterable
 from six import string_types, text_type

fixes the problem.