bug fix when using refit=False (#385)

bug fix when using refit=False

Author: selay01

mlxtend/regressor/stacking_cv_regression.py

@@ -140,8 +140,8 @@ def fit(self, X, y, groups=None):
             self.regr_ = [clone(clf) for clf in self.regressors]
             self.meta_regr_ = clone(self.meta_regressor)
         else:
-            self.clfs_ = self.regressors
-            self.meta_clf_ = self.meta_regressor
+            self.regr_ = self.regressors
+            self.meta_regr_ = self.meta_regressor
 
         kfold = check_cv(self.cv, y)
         if isinstance(self.cv, int):