Update cloudinary to 1.20.0

lib/cloudinary/cache/storage/key_value_storage.py

@@ -0,0 +1,51 @@
+from abc import ABCMeta, abstractmethod
+
+
+class KeyValueStorage:
+    """
+    A simple key-value storage abstract base class
+    """
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def get(self, key):
+        """
+        Get a value identified by the given key
+
+        :param key: The unique identifier
+
+        :return: The value identified by key or None if no value was found
+        """
+        raise NotImplementedError
+
+    @abstractmethod
+    def set(self, key, value):
+        """
+        Store the value identified by the key
+
+        :param key: The unique identifier
+        :param value: Value to store
+
+        :return: bool True on success or False on failure
+        """
+        raise NotImplementedError
+
+    @abstractmethod
+    def delete(self, key):
+        """
+        Deletes item by key
+
+        :param key: The unique identifier
+
+        :return: bool True on success or False on failure
+        """
+        raise NotImplementedError
+
+    @abstractmethod
+    def clear(self):
+        """
+        Clears all entries
+
+        :return: bool True on success or False on failure
+        """
+        raise NotImplementedError