Remove travis ci and set codecov percentage

stree/tests/Strees_test.py

@@ -41,22 +41,6 @@ class Stree_test(unittest.TestCase):
         except KeyError:
             pass
 
-    def _get_Xy(self):
-        X, y = make_classification(
-            n_samples=1500,
-            n_features=3,
-            n_informative=3,
-            n_redundant=0,
-            n_repeated=0,
-            n_classes=2,
-            n_clusters_per_class=2,
-            class_sep=1.5,
-            flip_y=0,
-            weights=[0.5, 0.5],
-            random_state=self._random_state,
-        )
-        return X, y
-
     def _check_tree(self, node: Snode):
         """Check recursively that the nodes that are not leaves have the
         correct number of labels and its sons have the right number of elements