PEP8

Conflicts:
	imblearn/datasets/__init__.py
	imblearn/datasets/imbalance.py
	imblearn/datasets/tests/test_make_imbalance.py

Author: Guillaume Lemaitre

imblearn/under_sampling/nearmiss.py

@@ -196,8 +196,8 @@ def _sample(self, X, y):
         # Assign the parameter of the element of this class
         # Check that the version asked is implemented
         if self.version not in [1, 2, 3]:
-            raise ValueError("Parameter 'version' must be 1, 2 or 3, "
-	                     "got {0}".format(self.version))
+            raise ValueError('Parameter `version` must be 1, 2 or 3, got'
+                             ' {}'.format(self.version))
 
         # Start with the minority class
         X_min = X[y == self.min_c_]