MAINT remove unused exceptions

Author: mfeurer

openml/exceptions.py

@@ -1,13 +1,3 @@
-class OpenMLStatusChange(Warning):
-    def __init__(self, message):
-        super(OpenMLStatusChange, self).__init__(message)
-
-
-class OpenMLDatasetStatusChange(OpenMLStatusChange):
-    def __init__(self, message):
-        super(OpenMLDatasetStatusChange, self).__init__(message)
-
-
 class PyOpenMLError(Exception):
     def __init__(self, message):
         super(PyOpenMLError, self).__init__(message)