[MRG] DOC Correcting EasyEnsemble doc (scikit-learn-contrib#234)

In EasyEnsemble doc page, its signature is

> class imblearn.ensemble.EasyEnsemble(ratio='auto', return_indices=False, random_state=None, replacement=False, n_subsets=10)

with `return_indices=False`, but its pydoc says

> return_indices : bool, optional (default=True)
>
>Whether or not to return the indices of the samples randomly selected from the majority class.

Checking the code at https://github.com/scikit-learn-contrib/imbalanced-learn/blob/b45a3e4167d188ec9fd40afd3a56330aa80a5ee1/imblearn/ensemble/easy_ensemble.py#L92, the correct value is False.

imblearn/ensemble/easy_ensemble.py

@@ -24,7 +24,7 @@ class EasyEnsemble(BaseMulticlassSampler):
         of samples in the minority class over the the number of samples
         in the majority class.
 
-    return_indices : bool, optional (default=True)
+    return_indices : bool, optional (default=False)
         Whether or not to return the indices of the samples randomly
         selected from the majority class.