remove some warnings (use collections.abc.Hashable instead of collections.Hashable)

tomoscan/esrf/test/test_edfscan.py

@@ -58,9 +58,9 @@ class TestTomoBaseHashable(unittest.TestCase):
 
     def test_is_hashable(self):
         tomo_base = TomoScanBase(scan=self._folder, type_='toto')
-        self.assertTrue(isinstance(tomo_base, collections.Hashable))
+        self.assertTrue(isinstance(tomo_base, collections.abc.Hashable))
         tomo_scan = EDFTomoScan(self._folder)
-        self.assertTrue(isinstance(tomo_scan, collections.Hashable))
+        self.assertTrue(isinstance(tomo_scan, collections.abc.Hashable))
 
 
 class TestScanFactory(unittest.TestCase):